152 results on '"Lorente-Velázquez A"'
Search Results
2. Refractive outcomes after V4c Toric collamer lens implantation over 1y of follow-up
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Humberto Carreras-Díaz, Josefina Reñones de Abajo, María del Rosario Carreras-Díaz, and Amalia Lorente-Velázquez
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v4c toric collamer lens ,corneal astigmatism ,surgically induced astigmatism ,corneal coupling ,Ophthalmology ,RE1-994 - Abstract
AIM: To evaluate refractive outcomes and corneal astigmatism changes after Toric implantable collamer lens with a central port (V4c T-ICL) implantation over 1y of follow-up. METHODS: A retrospective study was performed including 50 eyes of 50 patients that underwent V4c T-ICL implantation. Uncorrected (UDVA) and corrected (CDVA) distance visual acuities, refraction, refractive and corneal astigmatism changes and corneal coupling correction were evaluated preoperatively, 1 and 12mo postoperatively. Vector analysis was used for astigmatism changes. Coefficient of adjustment (CAdj) was calculated for corneal coupling analysis. RESULTS: The mean UDVA achieved was 0.03 logMAR at 1mo and remained unchanged throughout the whole follow-up (P=0.193). At the last visit, 84% of the eyes achieved a CDVA of 0.00 logMAR or better. Regarding spherical equivalent refraction (SEQ), 96% of eyes were ranges of ±1.00 D and 84% of them within ±0.50 D. Also, 94% of eyes had a remaining refractive cylinder within ±1.00 D and 78% of them within ±0.50 D. Both, SEQ and refractive cylinder, remain stable over the postoperative follow-up (P=1.000 and P=0.660, respectively). In terms of surgically induced astigmatism (SIA), no statistically significant differences were found over the follow-up (P=0.102) and under correction was found with a correction index lower than the unit at each visit. A keratometric astigmatism induced of 0.59±0.53 (vector mean: 0.26×73º) D was reached at the last visit. No significant changes in terms of corneal astigmatism orientation were reported over post-surgery visits (P=0.129 and P=0.097 at 1 and 12mo respectively). No clinical significance was found for CAdj on with-the-rule astigmatism. No postoperative complications resulting from the surgery were found. CONCLUSION: Refractive outcomes suggest that the V4c T-ICL implantation for correction of myopic astigmatism was satisfactory in terms of effectiveness, safety, and stability during 1y of follow-up. Corneal astigmatism induced by the incision around 0.5 D is achieved according to the remaining refractive cylinder found at one-year post-surgery. Corneal coupling analysis results in no unexpected spherical change.
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- 2024
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3. Content development for a new item-bank for measuring multifocal contact lens performance
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Elsa Albero-Ros, Amalia Lorente-Velázquez, and Mariano González-Pérez
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Presbyopia ,Patient-reported outcome ,Qualitative research ,Content-validity ,Item bank ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background Presbyopia is an age-related condition that causes a decreased ability to focus on nearby objects. Multifocal contact lenses are commonly used to address this issue. However, there seems to be a notable dissatisfaction among multifocal contact lens wearers. The absence of a reliable instrument to measure the patient’s perspective, despite the widespread use of this method, highlights the need for further research in this area. Objective The objective of this study is to develop an item-bank integrating all domains necessary to assess the patient’s perspective on multifocal contact lens performance, offering a comprehensive measure. The item-bank will ensure a high level of content validity, be self-administered, and will initially be available in Spanish. The aim of this tool is to serve as a valuable resource for research and optometric clinics, facilitating the follow-up of patients with presbyopia who wear multifocal contact lenses or those who are newly starting to use them. Methodology The MCL-PRO item bank, followed a systematic and step-wise inductive approach to gather information, following the recommendations outlined in the COSMIN guidelines and similar studies. The process involved the following steps: (1) Literature review and relevant existing items identification (2) Social media review, (3) Semi-structured focus groups, (4) performing qualitative analysis, (5) refining and revising the items, and (6) generating the content of the item bank. Results A total of 575 items were included in the item-bank hosted under 8 different domains that were found to be important for presbyopic population: visual symptoms (213), activity limitation (111), ocular symptoms (135), convenience (36), emotional well-being (33), general symptoms (16), cognitive issues (21) and economic issues (10). Conclusion The item-bank created has followed standardised methodology for its development and encloses all the aspects for MCL performance evaluation from patients perspective.
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- 2024
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4. Content development for a new item-bank for measuring multifocal contact lens performance
- Author
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Albero Ros, Elsa, Lorente Velázquez, Amalia, González Pérez, Mariano, Albero Ros, Elsa, Lorente Velázquez, Amalia, and González Pérez, Mariano
- Abstract
Received: 04 July 2023; Accepted: 18 January 2024; Published: 08 February 2024, Background: Presbyopia is an age-related condition that causes a decreased ability to focus on nearby objects. Multifocal contact lenses are commonly used to address this issue. However, there seems to be a notable dissatisfaction among multifocal contact lens wearers. The absence of a reliable instrument to measure the patient's perspective, despite the widespread use of this method, highlights the need for further research in this area. Objective: The objective of this study is to develop an item-bank integrating all domains necessary to assess the patient's perspective on multifocal contact lens performance, offering a comprehensive measure. The item-bank will ensure a high level of content validity, be self-administered, and will initially be available in Spanish. The aim of this tool is to serve as a valuable resource for research and optometric clinics, facilitating the follow-up of patients with presbyopia who wear multifocal contact lenses or those who are newly starting to use them. Methodology: The MCL-PRO item bank, followed a systematic and step-wise inductive approach to gather information, following the recommendations outlined in the COSMIN guidelines and similar studies. The process involved the following steps: (1) Literature review and relevant existing items identification (2) Social media review, (3) Semi-structured focus groups, (4) performing qualitative analysis, (5) refining and revising the items, and (6) generating the content of the item bank. Results: A total of 575 items were included in the item-bank hosted under 8 different domains that were found to be important for presbyopic population: visual symptoms (213), activity limitation (111), ocular symptoms (135), convenience (36), emotional well-being (33), general symptoms (16), cognitive issues (21) and economic issues (10). Conclusion: The item-bank created has followed standardised methodology for its development and encloses all the aspects for MCL performance evaluation from patien, Depto. de Optometría y Visión, Fac. de Óptica y Optometría, TRUE, pub
- Published
- 2024
5. Randomized crossover trial of silicone hydrogel contact lenses
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García-Montero, María, Rico-del-Viejo, Laura, Llorens-Quintana, Clara, Lorente-Velázquez, Amalia, Hernández-Verdejo, Jose Luis, and Madrid-Costa, David
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- 2019
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6. Comparison of the impact of nesofilcon A hydrogel contact lens on the ocular surface and the comfort of presbyopic and non-presbyopic wearers
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Amalia Lorente-Velázquez, María García-Montero, Francisco Javier Gómez-Sanz, Laura Rico del Viejo, José Luis Hernández-Verdejo, and David Madrid-Costa
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nesofilcon a hydrogel material ,ocular surface parameters ,presbyopia ,multifocal daily contact lenses ,Ophthalmology ,RE1-994 - Abstract
AIM: To assess and compare the impact of a daily disposable contact lens (CL) with high water content on the ocular surface and comfort of the presbyopic and non-presbyopic population after one day of use. METHODS: Totally 20 presbyopes and 30 non-presbyopes non-contact wearers were fitted with nesofilcon A CLs. CL thickness was measured to assess material stability during daily wear, and ocular surface parameters were also assessed. Optical quality was analyzed for all cases. In addition, CL comfort was rated. RESULTS: No significant differences were found in CL thickness, tear film osmolarity, average tear break-up time, bulbar redness, central corneal thickness, corneal volume, root-mean-square of higher-order aberrations (RMS of HOAs) and vertical and horizontal coma, either as a function of the group or time of use. A significant decrease in tear meniscus height and first break-up of the tear film was found in the presbyopic group (P=0.038; P=0.007 respectively). A decrease in spherical aberration coefficient was found after CL insertion (P=0.031 monofocal CL; P=0.023 low addition multifocal CL; P=0.016 high addition multifocal CL). Multifocal CL were thicker than monofocal CL (P=0.045). Comparison between groups showed more discomfort in presbyopes than non-presbyopes (P=0.003). CONCLUSION: This study evidence that the behavior of the daily disposable CL with high water content seems to be stable during the day of use. Ocular parameters measured during wear show that CL behavior is the same for presbyopes and non-presbyopes, being more uncomfortable for presbyopes.
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- 2019
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7. The effect of ageing on the ocular surface parameters
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Rico-del-Viejo, Laura, Lorente-Velázquez, Amalia, Hernández-Verdejo, José Luis, García-Mata, Ricardo, Benítez-del-Castillo, José Manuel, and Madrid-Costa, David
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- 2018
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8. Forward‐scattered and backward‐scattered light in moderate keratoconus
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Villanueva, Celia, primary, Viviano, Francesco, additional, García‐Montero, María, additional, Lorente‐Velázquez, Amalia, additional, Martínez‐Alberquilla, Irene, additional, and Garzón, Nuria, additional
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- 2023
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9. Effects of Blink Rate on Tear Film Optical Quality Dynamics with Different Soft Contact Lenses
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María García-Montero, Laura Rico-del-Viejo, Irene Martínez-Alberquilla, Jose Luis Hernández-Verdejo, Amalia Lorente-Velázquez, and David Madrid-Costa
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Ophthalmology ,RE1-994 - Abstract
Objective. The aim of this study was to investigate tear film optical quality dynamics for four types of silicone hydrogel contact lenses (SHCLs) for daily wear over a 15-day period and for different blink rate (BR) patterns. Methods. A prospective randomized, double-blind, cross-over pilot study including four SHCLs (A: lotrafilcon B (Air Optix plus HydraGlyde, Alcon Laboratories); B: samfilcon A (Ultra, Bausch & Lomb); C: comfilcon A (Biofinity, CooperVision); and D: filcom V3 (Blu:gen, Mark’Ennovy)). Serial measurements of Objective Scatter Index (OSI) using the HD Analyzer (Visiometrics S.L., Terrassa, Spain) were taken at different blinking patterns: blinking every 2.5 seconds (high BRs) and every 9 seconds (low BRs). They were performed during the first visit before CL insertion (baseline), after 20 minutes of CL wear (Day 1), and during the last visit after 8 hours of CL wear on day 15 of use (Day 15). Results. Normal young healthy subjects were recruited and fitted with the four lenses. For low BRs, the mean OSI value increased over time for all CLs and the slope of the curve also increased for all CLs, except for CL D. However, for high BRs, the mean OSI value increased only for CLs B and C and the slope of the curve did not change over time for any of them. Conclusions. These results suggest that the tear film optical quality dynamics after wearing SCHLs for 15 days seems to undergo a slight deterioration only for lowest BR.
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- 2019
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10. Forward-scattered and backward-scattered light in moderate keratoconus
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Celia Villanueva, Francesco Viviano, María García‐Montero, Amalia Lorente‐Velázquez, Irene Martínez‐Alberquilla, and Nuria Garzón
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Ophthalmology ,Óptica fisiológica ,Oftalmología ,Anatomía ocular ,Sensory Systems ,Optometry - Abstract
Introduction: To evaluate the backscattered light, objective scatter index (OSI) and retinal straylight in patients with moderate keratoconus and healthy control subjects. Methods: A prospective observational study was developed with 33 patients in the moderate-keratoconus group (KC) and 34 in the non-keratoconus group (NKC). Corneal densitometry was obtained using Scheimpflug corneal tomography and measurements were expressed in grayscale units (GSU) over four zones within a 12.00 mm diameter around the corneal apex. A straylight meter was used to determine the amount of intraocular straylight under scotopic conditions, and the straylight parameter (LOG(s)) and test duration were recorded. The Optical Quality Analysis System based on the double-pass technique determined the OSI value. Results: Significant differences were observed between the KC and NKC groups for corneal densitometry (except in the 6–10 mm zone), OSI and retinal straylight. A moderate and significant correlation was found between OSI and retinal straylight LOG(s) (r = 0.52, p = 0.002). Weaker and non-significant correlations were found between corneal densitometry and the other parameters analysed (i.e., OSI, retinal straylight LOG(s) and retinal straylight times). Conclusions: Backscattered light, retinal straylight and the OSI show clear differences between healthy eyes and those with moderate KC. The changes present in the stages of KC evaluated in the current study (stages II and III according to the Amsler–Krumeich classification) might alter the scattering of the light entering the eye.
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- 2023
11. Content identification for the multifocal contact lens patient‐reported outcomes (MCL‐PRO) instrument item bank
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Ros, Elsa Albero, primary, Lorente‐Velázquez, Amalia, additional, and Gonzalez‐Perez, Mariano, additional
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- 2022
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12. Content identification for the multifocal contact lens patient‐reported outcomes ( <scp>MCL‐PRO</scp> ) instrument item bank
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Elsa Albero Ros, Amalia Lorente‐Velázquez, and Mariano Gonzalez‐Perez
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Ophthalmology ,General Medicine - Published
- 2022
13. Long-term changes in straylight induced by corneal refractive therapy: A pilot study
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Lorente-Velázquez, Amalia, González Mesa, Ana, Gutierrez, Jose Ramón, Villa-Collar, Cesar, and Nieto-Bona, Amelia
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- 2014
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14. Nonsurgical Procedures for Keratoconus Management
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L. Rico-Del-Viejo, M. Garcia-Montero, J. L. Hernández-Verdejo, S. García-Lázaro, F. J. Gómez-Sanz, and A. Lorente-Velázquez
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Ophthalmology ,RE1-994 - Abstract
Objectives. To describe the past 20 years’ correction modalities for keratoconus and their visual outcomes and possible complications. Methods. A review of the published literature related to the visual outcomes and possible complications in the context of keratoconus management using nonsurgical procedures for the last 20 years (glasses and contact lenses) was performed. Original articles that reported the outcome of any correction modalities of keratoconus management were reviewed. Results. The most nonsurgical procedure used on keratoconus management is the contact lens fitting. Soft contact lenses and soft toric contact lenses, rigid gas-permeable contact lenses, piggyback contact lens system, hybrid contact lenses, and scleral and corneoscleral contact lenses form the contemporary range of available lens types for keratoconus management with contact lenses. All of them try to restore the vision, improve the quality of life, and delay surgical procedures in patients with this disease. Complications are derived from the intolerance of using contact lens, and the use of each depends on keratoconus severity. Conclusions. In the context of nonsurgical procedures, the use of contact lenses for the management of keratoconic patients represents a good alternative to restore vision and improve the quality of live in this population.
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- 2017
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15. Biomechanical properties in corneal refractive therapy during adaptation period and after treatment interruption: A pilot study
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Nieto-Bona, Amelia, González-Mesa, Ana, Villa-Collar, César, and Lorente-Velázquez, Amalia
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- 2012
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16. Biomechanical properties in corneal refractive therapy during adaptation period and after treatment interruption: A pilot study
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Amelia Nieto-Bona, Ana González-Mesa, César Villa-Collar, and Amalia Lorente-Velázquez
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Cornea ,Biomechanical properties ,Corneal refractive therapy ,Corneal hysteresis ,Ophthalmology ,RE1-994 ,Optics. Light ,QC350-467 - Abstract
Purpose: To evaluate the potential influence and treatment-related changes of the corneal biomechanical properties (BMP) measured with the Ocular Response Analyzer (ORA, Reichert, Depew, NY) 15-days and 1-month after the initiation and cessation of corneal refractive therapy (CRT). Methods: Twenty-four young healthy subjects (24.04 ± 3.19 years) participated in two different experiments. In the first one (#1), twelve right eyes from 12 subjects who were fitted with CRT lenses were evaluated after 15 days and 1 month of lens wear. In the second trial (#2) 12 subjects who had been wearing CRT lenses for a period of 1 year were evaluated at 15 days and 1 month after treatment interruption. Results: There was no statistically significant correlation between baseline BMP and absolute values of structural corneal parameters at 15 and 30 days treatment, and also when these variables were normalized according to the targeted refraction. In experiment #1, Corneal hysteresis (CH) reduction was observed over the time of treatment (p = 0.019), but no significant differences were observed in the Corneal Resistance Factor (CRF) values. In addition, CRF reduction significantly correlated with spherical equivalent refraction (r = 0.597; p = 0.044), but no correlation was observed between CH or CRF reduction and the spherical component of the refraction. In experiment #2, no significant changes in CH or CRF were found initially after lens wear interruption, but a trend to increase was observed thereafter. Conclusion: CH decreases during onset of the CRT after 30 days of lens wear. Such changes seem to be reversible after cessation of contact lens wear following 1 year of treatment. Corneal biomechanics, however, do not predict the outcomes of CRT in clinical setting although with the data obtained some correlative tendencies were observed that may merit further investigation.
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- 2012
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17. Changes in Optical Quality Induced by Tilt and Decentration of a Trifocal IOL and a Novel Extended Depth of Focus IOL in Eyes With Corneal Myopic Ablations
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Ruiz-Alcocer, Javier, primary, Martínez-Alberquilla, Irene, additional, Rementería-Capelo, Laureano A., additional, De Gracia, Pablo, additional, and Lorente-Velázquez, Amalia, additional
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- 2021
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18. Effect of defocus combined with rotation on the optical performance of trifocal toric IOLs
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Javier Ruiz-Alcocer, Irene Martínez-Alberquilla, José F. Alfonso, Amalia Lorente-Velázquez, and David Madrid-Costa
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medicine.medical_treatment ,Intraocular lens ,Rotation ,Residual ,Prosthesis Design ,Refraction, Ocular ,03 medical and health sciences ,0302 clinical medicine ,Quality (physics) ,Optics ,Optical transfer function ,medicine ,Cylinder ,Humans ,Dioptre ,Vision, Ocular ,Physics ,Lenses, Intraocular ,Phacoemulsification ,business.industry ,Astigmatism ,General Medicine ,Refractive Errors ,Ophthalmology ,Cardinal point ,030221 ophthalmology & optometry ,business ,030217 neurology & neurosurgery - Abstract
Purpose: To objectively analyze the optical quality of the FineVision Toric intraocular lens (IOL) with two cylinder powers when different combinations of rotations and residual refractive errors are induced. Methods: This study assessed the FineVision Toric IOL with two different cylinder powers: 1.5 and 3.0 diopters (D). Three different rotation positions were considered: centered, 5° and 10° rotated. An optical bench (PMTF) was used for optical analysis. The optical quality of the IOLs was calculated by the modulation transfer function (MTF) at five different focal points (0.0, 0.25, 0.50, 0.75, and 1.00 D). Results: The MTF averaged value of the reference situation was 38.58 and 37.74 for 1.5 and 3.0 D of cylinder, respectively. For the 1.5 D cylinder, the combination of 5° of rotation with a defocus of 0.25, 0.50, 0.75, and 1.0 D induced a decrease on the MTF of 12.39, 19.94, 23.43, 24.23 units, respectively. When induced rotation was 10°, the MTF decrease was 17.26, 23.40, 24.33, 24.48 units, respectively. For the 3.0 D cylinder, the combination of 5° with 0.25, 0.50, 0.75, and 1.0 D of defocus, induced a decrease on the MTF of 12.51, 18.97, 22.36, 22.48 units, respectively. When induced rotation was 10°, the MTF decrease was: 18.42, 21.57, 23.08, and 23.61 units, respectively. Conclusion: For both FineVision Toric IOLs there is a certain optical tolerance to rotations up to 5° or residual refractive errors up to 0.25 D. Situations over these limits and their combination would affect the visual quality of patients implanted with these trifocal toric IOLs.
- Published
- 2021
19. Diseño y creación de recursos digitales para elaborar, tutorizar y evaluar un Trabajo Fin de Grado en el sistema híbrido de enseñanza presencial-virtual
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Bonnin Arias, Cristina, Santurtun de la Hoz, Maria Jesus, Lorente Velázquez, Amalia, Pitarch, Aida, Puell Marín, María Cinta, de la Torre Adrados, Almudena Rosario, Domínguez Valdés, Maria Teresa, Feijoo Garcia, Jennifer, Bonnin Arias, Cristina, Santurtun de la Hoz, Maria Jesus, Lorente Velázquez, Amalia, Pitarch, Aida, Puell Marín, María Cinta, de la Torre Adrados, Almudena Rosario, Domínguez Valdés, Maria Teresa, and Feijoo Garcia, Jennifer
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- 2021
20. Cirugía de ojo seco y cataratas
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O'Donell, Clare, Wolffsohn, James, Lorente Velázquez, Amalia, Ipek, Tugce, O'Donell, Clare, Wolffsohn, James, Lorente Velázquez, Amalia, and Ipek, Tugce
- Abstract
La cirugía de cataratas , uno de los procedimientos quirúrgicos realizados con más frecuencia en el mundo, es segura y eficaz. Sin embargo, este tipo de cirugía es un factor de riesgo para la enfermedad del ojo seco que puede conllevar a una insatisfacción con el resultado postquirúrgico y puede afectar negativamente a la calidad de vida del paciente. En la presente tesis se ha utilizado un modelo in vitro para explorar los posibles factores por los cuales la cirugía oftálmica podría impactar en la superficie ocular y, a su vez, conducir a signos y síntomas postquirúrgicos que son característicos del ojo seco. Estos incluyeron la exposición a la luz del microscopio quirúrgico y el uso de agentes antisépticos tales como la povidona yodada..., Cataract surgery, one of the most frequently performed surgical procedures in the world, is safe and efficacious, however, it is a risk factor for dry eye disease which can lead to dissatisfaction with the outcome and can adversely impact quality of life. This thesis explores possible mechanisms whereby ophthalmic surgery could impact on the ocular surface and, in turn, lead to dry eye signs and symptoms postoperatively. Contributing factors may include light from the operating microscope, disruption of ocular tissues and antiseptic agents used such as povidone iodine.This research attempted to understand the how cataract surgery affects the ocular surface by using an in vitro model. Porcine conjunctival fibroblasts were assessed after exposure to some of the stressors associated with surgery to observe the possible damage with three different approaches...
- Published
- 2021
21. Relationship between anterior corneal asphericity and refractive variables
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Nieto-Bona, Amelia, Lorente-Velázquez, Amalia, and Mòntes-Micó, Robert
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- 2009
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22. Effect of defocus combined with rotation on the optical performance of trifocal toric IOLs
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Ruiz-Alcocer, Javier, primary, Martínez-Alberquilla, Irene, additional, Lorente-Velázquez, Amalia, additional, Alfonso, José F, additional, and Madrid-Costa, David, additional
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- 2021
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23. Optical tolerance to rotation of trifocal toric intraocular lenses as a function of the cylinder power
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Javier Ruiz-Alcocer, Amalia Lorente-Velázquez, David Madrid-Costa, and Pablo de Gracia
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genetic structures ,medicine.medical_treatment ,Intraocular lens ,Rotation ,Prosthesis Design ,Refraction, Ocular ,03 medical and health sciences ,0302 clinical medicine ,Optics ,Cirugía ,Optical transfer function ,medicine ,Perpendicular ,Optometría ,Cylinder ,Humans ,Vision, Ocular ,Physics ,Lenses, Intraocular ,medicine.diagnostic_test ,business.industry ,Astigmatism ,General Medicine ,Function (mathematics) ,Corneal topography ,eye diseases ,Vergence (optics) ,Ophthalmology ,030221 ophthalmology & optometry ,Óptica oftálmica ,sense organs ,business ,030217 neurology & neurosurgery - Abstract
Background The aim was to assess the impact of 5- and 10-degree rotations in the optical quality of a trifocal toric intraocular lens with different amounts of cylinder. Methods Two Physiol Toric intraocular lenses with 1.5 and 3.0 D of cylinder were analysed in three different positions: centred, 5 and 10 degrees rotated. The optical quality of the intraocular lenses was evaluated with the PMTF optical bench through specific perpendicular targets. The analysis was performed by the through-focus modulation transfer function curves and the modulation transfer function corresponding to distance vision (0 D of vergence). Results For a centred situation, the through-focus modulation transfer function curves of both intraocular lenses showed the classical three peaks corresponding to the powers of the two principal meridians of the intraocular lenses. When 5 and 10 degrees of rotation were induced, the three peaks were attenuated in both cases. The case with the intraocular lens with 3.0 D of cylinder and 10 degrees of rotation showed the worst optical quality and a significant loss of trifocality. The modulation transfer function values obtained for distance vision also showed the worst optical quality for the intraocular lens with 3.0 D of cylinder and 10 degrees of rotation. Conclusion Rotations over 5 degrees decreased the optical quality of trifocal toric intraocular lenses, being this reduction moderate from 5 to 10 degrees for low levels of cylinder (≤1.5 D). For mid-high levels of cylinder (≥3.0 D), rotations over 5 degrees cause a significant loss of optical quality at all object distances.
- Published
- 2020
24. Cirugía de ojo seco y cataratas
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Ipek, Tugce, O'Donell, Clare, Wolffsohn, James, Lorente Velázquez, Amalia, Ipek, Tugce, O'Donell, Clare, Wolffsohn, James, and Lorente Velázquez, Amalia
- Abstract
La cirugía de cataratas , uno de los procedimientos quirúrgicos realizados con más frecuencia en el mundo, es segura y eficaz. Sin embargo, este tipo de cirugía es un factor de riesgo para la enfermedad del ojo seco que puede conllevar a una insatisfacción con el resultado postquirúrgico y puede afectar negativamente a la calidad de vida del paciente. En la presente tesis se ha utilizado un modelo in vitro para explorar los posibles factores por los cuales la cirugía oftálmica podría impactar en la superficie ocular y, a su vez, conducir a signos y síntomas postquirúrgicos que son característicos del ojo seco. Estos incluyeron la exposición a la luz del microscopio quirúrgico y el uso de agentes antisépticos tales como la povidona yodada...
- Published
- 2020
25. Optical Performance of a Trifocal IOL and a Novel Extended Depth of Focus IOL Combined With Different Corneal Profiles
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Ruiz-Alcocer, Javier, primary, Lorente-Velázquez, Amalia, additional, Hernández-Verdejo, José Luis, additional, De Gracia, Pablo, additional, and Madrid-Costa, David, additional
- Published
- 2020
- Full Text
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26. Optical tolerance to rotation of trifocal toric intraocular lenses as a function of the cylinder power
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Ruiz-Alcocer, Javier, primary, Lorente-Velázquez, Amalia, additional, de Gracia, Pablo, additional, and Madrid-Costa, David, additional
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- 2020
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27. Repeatability of Noninvasive Keratograph 5M Measurements Associated With Contact Lens Wear
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García-Montero, María, primary, Rico-del-Viejo, Laura, additional, Lorente-Velázquez, Amalia, additional, Martínez-Alberquilla, Irene, additional, Hernández-Verdejo, Jose Luis, additional, and Madrid-Costa, David, additional
- Published
- 2019
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28. Effect of defocus combined with rotation on the optical performance of trifocal toric IOLs.
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Ruiz-Alcocer, Javier, Martínez-Alberquilla, Irene, Lorente-Velázquez, Amalia, Alfonso, José F, and Madrid-Costa, David
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- 2022
- Full Text
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29. Optical Performance of a Trifocal IOL and a Novel Extended Depth of Focus IOL Combined With Different Corneal Profiles
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Javier Ruiz-Alcocer, José Luis Hernández-Verdejo, David Madrid-Costa, Pablo de Gracia, and Amalia Lorente-Velázquez
- Subjects
Optics and Photonics ,Materials science ,genetic structures ,medicine.medical_treatment ,Intraocular lens ,Prosthesis Design ,Refraction, Ocular ,Cornea ,03 medical and health sciences ,0302 clinical medicine ,Optics ,Cirugía ,Optical transfer function ,medicine ,Myopia ,Humans ,Óptica y optometría ,Dioptre ,Extended depth of focus ,business.industry ,Both lenses ,Models, Theoretical ,Multifocal Intraocular Lenses ,eye diseases ,Optical quality ,Vergence (optics) ,Ophthalmology ,Cardinal point ,030221 ophthalmology & optometry ,Óptica oftálmica ,Surgery ,sense organs ,business ,030217 neurology & neurosurgery - Abstract
PURPOSE: To assess the effect of prior myopic ablations on the optical performance of a trifocal diffractive intraocular lens (IOL) and a novel extended depth of focus (EDOF) diffractive design. METHODS: The novel XACT Mono-EDOF ME4 diffractive IOL (Santen Pharmaceutical) and the trifocal diffractive FineVision IOL (PhysIOL) were analyzed standing alone and combined with a simulated myopic corneal ablation. The optical quality of the IOLs in both situations was evaluated with the PMTF optical bench (LAMBDA-X). The through-focus modulation transfer function (MTF) curves and the MTF at three different focal points (+0.50, 0.00, and −0.50 diopters [D]) were recorded. RESULTS: The through-focus MTF curves showed three differentiated peaks for the trifocal IOL and two overlapped peaks for the EDOF IOL. The presence of simulated myopic corneal ablations induces a −0.50 D shift on the overall through-focus curves and softens the multifocal properties of both lenses by decreasing the variations through focus of the MTF. For the analysis of the lenses standing alone, the highest MTF values were obtained for an object vergence of 0.00 D. For a simulated myopic corneal ablation, both IOLs showed better optical quality results at −0.50 D. CONCLUSIONS: The trifocal IOL provides better optical quality at far and near distances when analyzed alone. The EDOF IOL optical properties are more stable when a myopic ablation is introduced. Preoperative calculations of both lenses should consider that prior myopic corneal ablations induce a −0.50 D shift on their far peak quality. [ J Refract Surg . 2020;36(7):435–441.]
- Published
- 2019
30. Repeatability of Noninvasive Keratograph 5M Measurements Associated With Contact Lens Wear
- Author
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David Madrid-Costa, Irene Martínez-Alberquilla, Laura Rico-del-Viejo, María García-Montero, José Luis Hernández-Verdejo, and Amalia Lorente-Velázquez
- Subjects
Adult ,Male ,Materials science ,Intraclass correlation ,Single measurement ,Lentes de contacto ,Hyperemia ,Cornea ,03 medical and health sciences ,Young Adult ,0302 clinical medicine ,Prosthesis fitting ,Prosthesis Fitting ,Tear meniscus height ,Myopia ,Humans ,Prospective Studies ,030222 orthopedics ,business.industry ,Corneal Topography ,Reproducibility of Results ,Repeatability ,Silicone hydrogel ,Contact Lenses, Hydrophilic ,Contact lens ,Ophthalmology ,Óptica fisiológica ,Tears ,030221 ophthalmology & optometry ,Female ,Time of use ,Nuclear medicine ,business - Abstract
Objetive: To assess the intrarater repeatability of the measurements of tear meniscus height (TMH), noninvasive keratograph tear break-up time (NIKBUTs), and ocular redness measurements obtained with the Keratograph 5M (K5M) in a sample of soft silicone hydrogel contact lens (CL) wearers over 15 days. Methods: Prospective study over two consecutive weeks. Three measurements of TMH, NIKBUTs (NIKBUT first and NIKBUT average), and ocular redness were obtained in different sessions; the first day (baseline, at 8 hr of wear, and after lens removal) and the last day of wear-15th day (at 8 hr of wear and after lens removal). The repeatability of measurements were assessed by two intraclass correlation coefficient (ICC) forms; single measurement [ICC (2,1)] and multiple measurements (k=3) [ICC (2, k)]. Results: Sixty-four eyes were analyzed. The repeatability of baseline TMH [ICC (2,1) greater than 0.90; coefficient of repeatability (CR)=0.06 mm] and after and during CL wear [ICC (2,k) greater than 0.90; CR≤0.07 mm] were excellent. The repeatability of baseline NIKBUT average [ICC (2,k)=0.89 (0.82-0.93); CR=6.07 sec] was maintained after CL removal but was poorer during CL wear. The repeatability of baseline NIKBUT first [ICC (2,k) =0.80 (0.69-0.87); CR=8.74 sec] was maintained after CL removal and during CL wear at moderate-good level. Conclusions: Intrarater repeatability of TMH, NIKBUTs, and ocular redness performed by K5M after CL wear remains stable when three measurements are performed. However, intrarater repeatability during CL wear decreased only for NIKBUT average and was not affected by time of use (15 days).
- Published
- 2019
31. Effects of Blink Rate on Tear Film Optical Quality Dynamics with Different Soft Contact Lenses
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Laura Rico-del-Viejo, José Luis Hernández-Verdejo, Irene Martínez-Alberquilla, David Madrid-Costa, María García-Montero, and Amalia Lorente-Velázquez
- Subjects
Change over time ,medicine.medical_specialty ,Article Subject ,Lentes de contacto ,03 medical and health sciences ,0302 clinical medicine ,CLs upper limits ,lcsh:Ophthalmology ,Ophthalmology ,Optometría ,Medicine ,030304 developmental biology ,0303 health sciences ,business.industry ,Healthy subjects ,Lotrafilcon B ,Silicone hydrogel ,Daily wear ,Optical quality ,Alcon Laboratories ,lcsh:RE1-994 ,030221 ophthalmology & optometry ,Óptica oftálmica ,business ,Research Article - Abstract
Objective. The aim of this study was to investigate tear film optical quality dynamics for four types of silicone hydrogel contact lenses (SHCLs) for daily wear over a 15-day period and for different blink rate (BR) patterns. Methods. A prospective randomized, double-blind, cross-over pilot study including four SHCLs (A: lotrafilcon B (Air Optix plus HydraGlyde, Alcon Laboratories); B: samfilcon A (Ultra, Bausch & Lomb); C: comfilcon A (Biofinity, CooperVision); and D: filcom V3 (Blu:gen, Mark’Ennovy)). Serial measurements of Objective Scatter Index (OSI) using the HD Analyzer (Visiometrics S.L., Terrassa, Spain) were taken at different blinking patterns: blinking every 2.5 seconds (high BRs) and every 9 seconds (low BRs). They were performed during the first visit before CL insertion (baseline), after 20 minutes of CL wear (Day 1), and during the last visit after 8 hours of CL wear on day 15 of use (Day 15). Results. Normal young healthy subjects were recruited and fitted with the four lenses. For low BRs, the mean OSI value increased over time for all CLs and the slope of the curve also increased for all CLs, except for CL D. However, for high BRs, the mean OSI value increased only for CLs B and C and the slope of the curve did not change over time for any of them. Conclusions. These results suggest that the tear film optical quality dynamics after wearing SCHLs for 15 days seems to undergo a slight deterioration only for lowest BR.
- Published
- 2019
32. Development of an in-vitro animal model to evaluate novel pharmaceutical approaches to ded management
- Author
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Menduni, Francesco, Wolffsohn, James, Davis, Leon, Lorente Velázquez, Amalia, Menduni, Francesco, Wolffsohn, James, Davis, Leon, and Lorente Velázquez, Amalia
- Abstract
In the ophthalmic field, multifactorial pathologies such as Dry Eye Disease (DED) and cataract are largely studied in living animal models that can fail to precisely mirror the complexity of these conditions in humans. Recent advances in biomedical technologies have improved the reliability of in-vitro/ex-vivo animal alternatives, and to date, the corneal and crystalline lens tissue have been independently maintained physiologicallystable for 10 days. This thesis details the development of a novel and complete ex-vivo anterior eye model, which is capable of sustaining both the cornea and crystalline lens in a physiologically stable state in loco for 7 days. The platform is based on porcine eyes, which represent a high quality and reliable human tissue source substitute, and being slaughterhouse waste, also perfectly align the project with the 3Rs principle of replacing, refining and reducing living animal experimentation...
- Published
- 2019
33. Aplicación de un programa informatizado para emitir informes clínicos en la asignatura de Clínica Optométrica I
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García Montero, María, Hernández Verdejo, Jóse Luis, Madrid Costa, David, Gómez Sanz, Fernando Javier, Lorente Velázquez, Amalia, Rico del Viejo, Laura, Martínez Alberquilla, Irene, García Montero, María, Hernández Verdejo, Jóse Luis, Madrid Costa, David, Gómez Sanz, Fernando Javier, Lorente Velázquez, Amalia, Rico del Viejo, Laura, and Martínez Alberquilla, Irene
- Abstract
El objetivo es optimizar el uso de un programa informático de registro y almacenamiento de datos clínicos y la creación de una nueva herramienta para generar informes clínicos. Los informes clínicos forman parte de la evaluación del alumno.
- Published
- 2019
34. Development of an in-vitro animal model to evaluate novel pharmaceutical approaches to ded management
- Author
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Wolffsohn, James, Davis, Leon, Lorente Velázquez, Amalia, Menduni, Francesco, Wolffsohn, James, Davis, Leon, Lorente Velázquez, Amalia, and Menduni, Francesco
- Abstract
In the ophthalmic field, multifactorial pathologies such as Dry Eye Disease (DED) and cataract are largely studied in living animal models that can fail to precisely mirror the complexity of these conditions in humans. Recent advances in biomedical technologies have improved the reliability of in-vitro/ex-vivo animal alternatives, and to date, the corneal and crystalline lens tissue have been independently maintained physiologicallystable for 10 days. This thesis details the development of a novel and complete ex-vivo anterior eye model, which is capable of sustaining both the cornea and crystalline lens in a physiologically stable state in loco for 7 days. The platform is based on porcine eyes, which represent a high quality and reliable human tissue source substitute, and being slaughterhouse waste, also perfectly align the project with the 3Rs principle of replacing, refining and reducing living animal experimentation..., Dentro del campo oftalmológico, patologías multifactoriales como Enfermedad del Ojo Seco (EOS) y Cataratas son ampliamente estudiadas a través de modelos animales que no reproducen con exactitud estas condiciones en humanos debido a su complejidad. Los recientes avances en la tecnología biomédica han mejorado la fiabilidad de modelos animales in-vitro/ex-vivo, y hasta el momento, el tejido de la córnea y cristalino se han mantenido fisiológicamente estables de forma independiente durante 10 días. Esta tesis describe el desarrollo de un nuevo y completo modelo de ojo anterior ex vivo, que es capaz de mantener tanto la córnea como el cristalino en un estado fisiológico estable durante 7 días. La plataforma se basa en ojos porcinos, que representan una fuente alternativa al tejido humano de alta calidad y fiable, y al tratarse de residuos de matadero, también alinea perfectamente el proyecto con el principio 3Rs de reemplazar, refinar y reducir la experimentación con animales vivos...
- Published
- 2019
35. Optical tolerance to rotation of trifocal toric intraocular lenses as a function of the cylinder power.
- Author
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Ruiz-Alcocer, Javier, Lorente-Velázquez, Amalia, de Gracia, Pablo, and Madrid-Costa, David
- Published
- 2021
- Full Text
- View/download PDF
36. Effects of Blink Rate on Tear Film Optical Quality Dynamics with Different Soft Contact Lenses
- Author
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García-Montero, María, primary, Rico-del-Viejo, Laura, additional, Martínez-Alberquilla, Irene, additional, Hernández-Verdejo, Jose Luis, additional, Lorente-Velázquez, Amalia, additional, and Madrid-Costa, David, additional
- Published
- 2019
- Full Text
- View/download PDF
37. Nonsurgical Procedures for Keratoconus Management
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María García-Montero, Laura Rico-del-Viejo, Amalia Lorente-Velázquez, Fernando Gómez-Sanz, Santiago García-Lázaro, and José Luis Hernández-Verdejo
- Subjects
Keratoconus ,genetic structures ,Population ,Lentes de contacto ,Context (language use) ,Review Article ,law.invention ,03 medical and health sciences ,0302 clinical medicine ,lcsh:Ophthalmology ,law ,medicine ,Optometría ,In patient ,education ,education.field_of_study ,Modalities ,business.industry ,Surgical procedures ,medicine.disease ,eye diseases ,Contact lens ,Lens (optics) ,Ophthalmology ,lcsh:RE1-994 ,030221 ophthalmology & optometry ,Optometry ,Oftalmología ,Óptica oftálmica ,sense organs ,business ,030217 neurology & neurosurgery - Abstract
Objectives. To describe the past 20 years’ correction modalities for keratoconus and their visual outcomes and possible complications.Methods. A review of the published literature related to the visual outcomes and possible complications in the context of keratoconus management using nonsurgical procedures for the last 20 years (glasses and contact lenses) was performed. Original articles that reported the outcome of any correction modalities of keratoconus management were reviewed.Results. The most nonsurgical procedure used on keratoconus management is the contact lens fitting. Soft contact lenses and soft toric contact lenses, rigid gas-permeable contact lenses, piggyback contact lens system, hybrid contact lenses, and scleral and corneoscleral contact lenses form the contemporary range of available lens types for keratoconus management with contact lenses. All of them try to restore the vision, improve the quality of life, and delay surgical procedures in patients with this disease. Complications are derived from the intolerance of using contact lens, and the use of each depends on keratoconus severity.Conclusions. In the context of nonsurgical procedures, the use of contact lenses for the management of keratoconic patients represents a good alternative to restore vision and improve the quality of live in this population.
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- 2017
38. Nonsurgical Procedures for Keratoconus Management
- Author
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Rico-Del-Viejo, L., Garcia-Montero, M., Hernández-Verdejo, J. L., García-Lázaro, S., Gómez-Sanz, F. J., and Lorente-Velázquez, A.
- Subjects
genetic structures ,Article Subject ,sense organs ,eye diseases - Abstract
Objectives. To describe the past 20 years’ correction modalities for keratoconus and their visual outcomes and possible complications. Methods. A review of the published literature related to the visual outcomes and possible complications in the context of keratoconus management using nonsurgical procedures for the last 20 years (glasses and contact lenses) was performed. Original articles that reported the outcome of any correction modalities of keratoconus management were reviewed. Results. The most nonsurgical procedure used on keratoconus management is the contact lens fitting. Soft contact lenses and soft toric contact lenses, rigid gas-permeable contact lenses, piggyback contact lens system, hybrid contact lenses, and scleral and corneoscleral contact lenses form the contemporary range of available lens types for keratoconus management with contact lenses. All of them try to restore the vision, improve the quality of life, and delay surgical procedures in patients with this disease. Complications are derived from the intolerance of using contact lens, and the use of each depends on keratoconus severity. Conclusions. In the context of nonsurgical procedures, the use of contact lenses for the management of keratoconic patients represents a good alternative to restore vision and improve the quality of live in this population.
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- 2017
- Full Text
- View/download PDF
39. The effect of ageing on the ocular surface parameters
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José Luis Hernández-Verdejo, David Madrid-Costa, Amalia Lorente-Velázquez, Jose M. Benitez-del-Castillo, Ricardo García-Mata, and Laura Rico-del-Viejo
- Subjects
medicine.medical_specialty ,Aging ,business.industry ,Surface Properties ,General Medicine ,Anatomía ocular ,03 medical and health sciences ,Ophthalmology ,0302 clinical medicine ,Ageing ,Tears ,030221 ophthalmology & optometry ,Medicine ,Humans ,Oftalmología ,Dry Eye Syndromes ,business ,Ocular surface ,030217 neurology & neurosurgery ,Optometry - Published
- 2017
40. Long-term changes in straylight induced by corneal refractive therapy: A pilot study
- Author
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Amalia Lorente-Velázquez, Amelia Nieto-Bona, Ana González Mesa, César Villa-Collar, and Jose Ramón Gutierrez
- Subjects
Adult ,Male ,medicine.medical_specialty ,Visual acuity ,Adolescent ,Light ,genetic structures ,Vision Disorders ,Emmetropia ,Pilot Projects ,Refraction, Ocular ,Sensitivity and Specificity ,Young Adult ,Cornea ,Ophthalmology ,Myopia ,medicine ,Humans ,Scattering, Radiation ,Longitudinal Studies ,Manifest refraction ,High contrast ,business.industry ,Reproducibility of Results ,Recovery of Function ,General Medicine ,eye diseases ,Third generation ,Treatment Outcome ,medicine.anatomical_structure ,Female ,sense organs ,medicine.symptom ,business ,Orthokeratologic Procedures ,Optometry - Abstract
PURPOSE: To assess long-term intraocular straylight changes induced by corneal refractive therapy (CRT) and to determine whether these changes persist after cessation of CRT lens wear. METHODS: A single-center, prospective, longitudinal study was performed in 22 subjects (group 1) undergoing overnight corneal refractive therapy for 1 year. Ten right eyes of 10 subjects (group 2) with emmetropia served as controls. In each subject, high contrast visual acuity (HCVA), manifest refraction and intraocular straylight were determined at several time points during treatment and 1 month after discontinuing treatment. Straylight was measured using the van den Berg straylight meter (third generation). EDTRS charts (logMAR units) were used to assess HCVA. For both groups, only data for the right eyes were analyzed. RESULTS: Straylight (mean ± standard deviation) significantly fell from baseline (0.98 ± 0.13) to values recorded after 1 month (0.88 ± 0.13, p=0.011), 3 months (0.88 ± 0.13, p=0.004), 6 months (0.88 ± 0.13, p=0.000) and 12 months (0.76 ± 0.12, p=0.003) of treatment. One month after discontinuing CRT lens wear, straylight was still significantly lower than baseline (0.89 ± 0.13, p=0.003). No correlations were observed between intraocular straylight and HCVA. CONCLUSIONS: Good refractive outcomes and reductions in straylight were observed in response to corneal refractive therapy for myopia. The reduction in straylight observed after discontinuing CRT warrents further investigation.
- Published
- 2014
41. Recovery Evaluation of Induced Changes in Higher Order Aberrations From the Anterior Surface of the Cornea for Different Pupil Sizes After Cessation of Corneal Refractive Therapy
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David Madrid-Costa, Jesús Carballo, Amalia Lorente-Velázquez, Ana González-Mesa, and Amelia Nieto-Bona
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Adult ,Male ,medicine.medical_specialty ,Adolescent ,genetic structures ,Visual Acuity ,Refraction, Ocular ,Pupil ,Young Adult ,Ophthalmology ,Cornea ,Orthokeratologic Procedures ,Humans ,Medicine ,Longitudinal Studies ,Prospective Studies ,Prospective cohort study ,medicine.diagnostic_test ,business.industry ,Corneal Topography ,Recovery of Function ,Refractive Errors ,Corneal topography ,Refraction ,eye diseases ,Contact lens ,Aberrations of the eye ,medicine.anatomical_structure ,Female ,sense organs ,business - Abstract
To assess corneal aberration changes induced by corneal refractive therapy (CRT) for different pupil sizes and to examine the recovery after cessation of contact lens wear.A single-center, prospective, and longitudinal study was performed. Thirty-four subjects who underwent CRT for 1 year were included. High-contrast corrected distance visual acuity (CDVA), manifest refraction, and corneal topography were determined during the treatment and 1 month after the discontinuation of the treatment. Corneal aberrations were calculated using the Vol-CT 6.89 software. Corneal spherical aberration, Z(4,0), and root mean square values (RMS) for coma-like, trefoil, tetrafoil, and higher order aberrations (HOAs) were estimated for different pupil sizes (3-, 4-, 5-, 6-, and 7-mm diameters). Early Treatment Diabetic Retinopathy Study charts were used to measure CDVA.The CRT treatment induced a statistically significant increase of all aberrations studied for all pupil diameters. RMS values for coma-like, trefoil, and tetrafoil aberrations and HOAs after cessation of contact lens wear were not statistically significantly different for any of the different pupil diameters studied at baseline. However, Z(4,0) significantly increased from baseline to 1 month after discontinuation of the CRT lens wear for 5-, 6-, and 7-mm diameter pupils.Our results suggest that CRT is a treatment completely reversible at 1 month after cessation of contact lens wear in terms of CDVA, refractive error, and RMS of coma-like aberrations and HOAs for all pupil sizes. However, for spherical aberration, 1 month is not enough to recover to the baseline level.
- Published
- 2013
42. The effect of ageing on the ocular surface parameters
- Author
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Rico del Viejo, Laura, Lorente Velázquez, Amalia, Hernández Verdejo, José Luis, García Mata, Ricardo, Benítez del Castillo, José Manuel, Madrid Costa, David, Rico del Viejo, Laura, Lorente Velázquez, Amalia, Hernández Verdejo, José Luis, García Mata, Ricardo, Benítez del Castillo, José Manuel, and Madrid Costa, David
- Published
- 2017
43. Impact of a daily hydrogel contact lens with higher water content on the ocular surface of young and presbyopes wearers
- Author
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Nina Tavberidze, Laura Rico del Viejo, David Madrid Costa, Amalia Lorente Velázquez, María García Montero, and José Luis Hernández Verdejo
- Subjects
Contact lens ,Ophthalmology ,medicine.medical_specialty ,Chemistry ,medicine ,General Medicine ,Ocular surface ,Water content ,Optometry - Published
- 2018
44. Meibomian gland dropout as a predictor of the success of the multifocal contact lens fitting: A pilot study
- Author
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David Madrid Costa, Laura Rico del Viejo, Nina Tavberidze, María García Montero, José Luis Hernández Verdejo, and Amalia Lorente Velázquez
- Subjects
Ophthalmology ,medicine.medical_specialty ,medicine.anatomical_structure ,business.industry ,medicine ,Meibomian gland ,General Medicine ,business ,Contact lens fitting ,Dropout (neural networks) ,Optometry - Published
- 2018
45. Intraocular Straylight and Contrast Sensitivity ½ and 6 Months After Laser In Situ Keratomileusis
- Author
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Amelia Nieto-Bona, Angel Ramón Gutiérrez Ortega, César Villa Collar, and Amalia Lorente-Velázquez
- Subjects
medicine.medical_specialty ,Visual acuity ,genetic structures ,business.industry ,Mesopic vision ,medicine.medical_treatment ,media_common.quotation_subject ,LASIK ,Keratomileusis ,eye diseases ,Contact lens ,Ophthalmology ,Optics ,Refractive surgery ,medicine ,Contrast (vision) ,medicine.symptom ,business ,Photopic vision ,media_common - Abstract
Objectives: To compare intraocular straylight and contrast sensitivity determined before and 15 days and 6 months after laser keratomileusis. Methods: A single-centre, prospective, longitudinal randomized trial was performed on 20 subjects undergoing refractive surgery. In each subject, best spectacle-corrected visual acuity (BSCVA) and straylight and contrast sensitivity were determined preoperatively (on the day of refractive surgery) and then after laser in situ keratomileusis (LASIK) surgery in the 15-day and 6-month follow-up visits. Straylight was measured using the van den Berg straylight meter (third generation). Contrast sensitivity was determined under photopic and mesopic conditions using the VCTS 6500 (Vision Contrast Test System). BSCVA was measured using Early Treatment Diabetic Retinopathy Study charts (LogMAR units). All measurements were obtained over time and compared. Results: Straylight values (mean ± SD) were 0.99 ± 0.03, 0.88 ± 0.03, and 0.93 ± 0.03 before and 1/2 and 6 months after LASIK surgery. These values significantly fell from preoperative levels to those recorded 15 days after LASIK (P = 0.03) although values at 6 months failed to differ from baseline (P>0.05). Photopic and mesopic contrast sensitivity measured at several spatial frequencies remained stable. No correlations between contrast sensitivity or BSCVA and intraocular straylight were observed 15 days and 6 months after LASIK. Conclusions: Intraocular straylight was reduced 15 days after surgery although by 6 months values returned to preoperative levels. These changes in straylight values could not be related to changes in mesopic and photopic contrast sensitivity or BSCVA during the follow-up period. Copyright © Contact Lens Association of Ophthalmologists, Inc.
- Published
- 2010
46. Cambios en el polo anterior tras la ortoqueratología nocturna
- Author
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González Mesa, Ana María, Nieto Bona, Amelia, Lorente Velázquez, Amalia, González Mesa, Ana María, Nieto Bona, Amelia, and Lorente Velázquez, Amalia
- Abstract
La Ortoqueratología nocturna (OKN) es una técnica que utiliza lentes de contacto especialmente diseñadas y adaptadas al ojo con el fin de modificar el contorno corneal induciendo un aplanamiento en la región central de la córnea, cambiando así el estado refractivo del mismo. El efecto buscado es similar al de la cirugía refractiva salvo que con este sistema, el efecto inducido es reversible. La aparición de lentes capaces de inducir de forma efectiva los cambios deseados en la córnea, en tan sólo siete días de manera rápida, eficaz y reversible, ha propiciado que esta técnica haya comenzado a utilizarse con resultados muy satisfactorios permitiendo que el paciente pueda estar libre de gafas o lentes de contacto durante el día. Esta terapia ha despertado un gran interés en la comunidad científica, convirtiéndose en una alternativa real a la Cirugía Refractiva. Además, se ha reportado en diversos estudios que el uso de lentes de OKN en niños, reduce el crecimiento axial entre un 30% y un 50%, en comparación con los niños que usan gafas o lentes de contacto 1-6 . El auge de la OKN y la creciente utilización de esta técnica en niños para el control de la miopía implica la necesidad de una mayor comprensión del mecanismo por el cual las LC de geometría inversa inducen la corrección del error refractivo en el ojo...
- Published
- 2016
47. Cambios en el polo anterior tras la ortoqueratología nocturna
- Author
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Nieto Bona, Amelia, Lorente Velázquez, Amalia, González Mesa, Ana María, Nieto Bona, Amelia, Lorente Velázquez, Amalia, and González Mesa, Ana María
- Abstract
La Ortoqueratología nocturna (OKN) es una técnica que utiliza lentes de contacto especialmente diseñadas y adaptadas al ojo con el fin de modificar el contorno corneal induciendo un aplanamiento en la región central de la córnea, cambiando así el estado refractivo del mismo. El efecto buscado es similar al de la cirugía refractiva salvo que con este sistema, el efecto inducido es reversible. La aparición de lentes capaces de inducir de forma efectiva los cambios deseados en la córnea, en tan sólo siete días de manera rápida, eficaz y reversible, ha propiciado que esta técnica haya comenzado a utilizarse con resultados muy satisfactorios permitiendo que el paciente pueda estar libre de gafas o lentes de contacto durante el día. Esta terapia ha despertado un gran interés en la comunidad científica, convirtiéndose en una alternativa real a la Cirugía Refractiva. Además, se ha reportado en diversos estudios que el uso de lentes de OKN en niños, reduce el crecimiento axial entre un 30% y un 50%, en comparación con los niños que usan gafas o lentes de contacto 1-6 . El auge de la OKN y la creciente utilización de esta técnica en niños para el control de la miopía implica la necesidad de una mayor comprensión del mecanismo por el cual las LC de geometría inversa inducen la corrección del error refractivo en el ojo...
- Published
- 2016
48. Influence of the gaze-stabilizing eye movements on the quality of the retinal image of the human eye
- Author
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Pons Moreno, Álvaro Máximo, Lorente Velázquez, Amalia, Illueca Contri, Carlos, Artigas Verde, José María, Felipe Marcet, Adelina, Universidad de Alicante. Departamento de Óptica, Farmacología y Anatomía, Universidad de Valencia. Departamento de Óptica, and Óptica y Ciencias de la Visión
- Subjects
Human eye ,Tremors and saccades ,genetic structures ,Quality of the retinal image ,sense organs ,Movements of the eye ,eye diseases ,Atomic and Molecular Physics, and Optics ,Óptica - Abstract
In this work we have studied the influence of the gaze stabilizing movements of the eye on the quality of the retinal image of the human eye obtained by double pass methods. The results obtained agree with the expected differences between the coherent and incoherent behaviour of the optical system of the eye. The movements-free retinal image is obtained from a typical retinal image by considering a filter function in the frequency domain which characterizes the effect of the considered movements.
- Published
- 2000
49. Propiedades biomecánicas en la terapia refractiva corneal durante el periodo de adaptación y tras la interrupción del tratamiento: estudio piloto
- Author
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Nieto-Bona, Amelia, González Mesa, Ana, Villa Collar, César, and Lorente-Velázquez, Amalia
- Subjects
Tratamiento médico ,Oftalmología - Abstract
Evaluar la influencia potencial y los cambios relacionados con el tratamiento de las propiedades biomecánicas corneales, medidas con el Analizador de Respuesta Ocular (ORA, Reichert, Depew, NY), durante los 15 días y 1 mes posteriores al comienzo e interrupción de la terapia refractiva corneal. No data (2013)
- Published
- 2013
50. Anterior segment changes produced in response to long-term overnight orthokeratology
- Author
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Amelia Nieto-Bona, Amalia Lorente-Velázquez, César Villa-Collar, and Ana González-Mesa
- Subjects
Adult ,Male ,medicine.medical_specialty ,Visual acuity ,Anterior Chamber ,Contact Lenses ,medicine.medical_treatment ,Treatment outcome ,Visual Acuity ,Statistics, Nonparametric ,Cellular and Molecular Neuroscience ,Young Adult ,Ophthalmology ,medicine ,Myopia ,Photography ,Humans ,Longitudinal Studies ,Prospective Studies ,Prospective cohort study ,Óptica ,Corneal curvature ,business.industry ,Orthokeratology ,Reproducibility of Results ,Axial length ,eye diseases ,Sensory Systems ,Axial Length, Eye ,Treatment Outcome ,Optometry ,Oftalmología ,Female ,medicine.symptom ,business ,Orthokeratologic Procedures - Abstract
To evaluate the effect of overnight orthokeratology (OK) on anterior chamber depth (ACD), posterior radius of corneal curvature (PRCC) and axial length (AL) over one year.In this prospective longitudinal study, measurements were made in 34 right eyes of 34 subjects at baseline, 15 days, 1 and 12 months after starting OK treatment. ACD and PRCC measurements were obtained using a Pentacam system and AL was measured using an IOL-Master. ACD and PRCC were measured along the horizontal and vertical meridians at 1 mm intervals. These measurements were expressed as the distance from the center in the nasal (N), temporal (T), superior (S) and inferior (I) directions.A significant reduction in ACD was observed in both meridians during treatment. PRCC flattened significantly in the (T) direction after 15 d (1 mm, p 0.05), at the corneal center after 15 d (p 0.01), in the (T) direction after 1 month (1 mm, p 0.05), in the (S) direction after 12 months (1 mm p 0.05), in the (N) direction after 12 months (1 mm p 0.05), in the (N) and (T) directions after 12 months (3 mm, p 0.05) and in the (T) direction after 12 months (4 mm p 0.05), at the corneal center after 12 months (p 0.01). AL was significantly reduced during treatment (p 0.05).A long period of OK reduces ACD and AL and changes PRCC.
- Published
- 2013
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