Search

Purpose: To compare the safety, efficacy, and visual outcomes of topography-guided (TG) LASIK ablation versus advanced ablation algorithm (AAA) on Zeiss Mel 90 on virgin eyes. Setting: A tertiary care hospital in north India. Design: A retrospective comparative study. Methods: Case sheets of 30 patients who underwent TG LASIK and 45 patients who underwent AAA LASIK between January 2021 and September 2022 were retrieved and reviewed. The TG group included 60 eyes of 30 patients, and the AAA group included age- and sex-matched 90 eyes of 45 patients. Both groups were compared for visual outcomes, residual refraction, and root-mean-square higher-order aberrations (rms HOA) at 1 week, 1 month, 3 months, and 6 months postoperatively and using unpaired t-test and Mann-Whitney U test. Results: The mean preoperative spherical equivalent in the TG group and AAA group was - 3.12 (1.67) and - 3.19 (1.61), respectively. The safety and efficacy of the treatment were 100% in both groups. The postoperative increase in rms HOA was comparable in both groups (P = 0.55). The ablation duration was significantly longer in topo-guided LASIK (P = 0.001). Conclusion: AAA LASIK on MEL 90 is comparable to topography-guided LASIK for the management of low myopia and myopic astigmatism. Keywords: AAA LASIK, LASIK, topo-guided LASIK, Author(s): Deeksha Rani (corresponding author) [1]; Sudarshan Khokhar [1]; Aishwarya Rathod [1]; Venkatesh Nathiya [1]; Amar Pujari [1]; Tavish Gupta [1] Laser-assisted in situ keratomileusis (LASIK) involves the use of [...]

The standard approach to contact lens correction of irregular astigmatism today and for the foreseeable future is to prescribe a non-flexing rigid gas permeable (GP) lens design, whether that be [...]

For these patients in particular, a one-size-fits-all approach just won't work. Here's how to handle several different kinds of patients in your chair. In the United States, around 30% of [...]

Byline: Zhi. Yang, Yanwen. Zhou, Tianru. Jin, Jingjing. Li Purpose: To evaluate a method using measured values of total corneal refractive power (TCRP) for a manufacturer's online calculator by comparing [...]

Byline: Our Bureau Johnson & Johnson Vision, a global leader in eye health and part of the Johnson & Johnson Medical Devices Companies has announced the availability of TECNIS Synergy [...]

Correcting Presbyopia Using innovative IOL Technology Patient lifestyles and evolving technology are transforming the way we treat the growing population of presbyopic patients. Today's presbyopes live their lives differently than [...]

Byline: Vivek. Singh, Muralidhar. Ramappa, Somasheila. Murthy, Audrey. Rostov Since the introduction of the first toric intraocular lens (IOLs) in the early 1990s, these lenses have become the preferred choice [...]

Approximately 4 million cataract procedures were performed in 2017--a number that will continue to grow. More than 70% of patients have more than 0.50D of preoperative astigmatism, which must be [...]

Byline: J. Reddy, C. Pooja, G. Prabhakar Purpose: To analyze the outcomes of phacoemulsification with high power customized toric intraocular lens implantation (IOL) in patients with high corneal astigmatism (6-10 [...]

Contact lens wearers live and work in a range of environmental conditions that can impact their wearing experience. For many, including presbyopic astigmats, this includes hours of each day spent [...]

We have witnessed a rise in clinical utilization of scleral lenses in recent years, and in some cases, their clinical indications have expanded to include even those patients with regular [...]

Myopia management is growing rapidly in popularity among the optometric community as well as with patients. Whether fitting a soft multifocal lens, figuring out when and how to prescribe atropine, [...]

Byline: Gitansha. Sachdev, Shivangi. Singh, Shreyas. Ramamurthy, Narayan. Rajpal, Ramamurthy. Dandapani Purpose: To compare clinical outcomes following implantation of two types of posterior chamber phakic intraocular lenses: Visian™ Implantable Collamer [...]

Byline: Nitin. Tiwari, Gitansha. Sachdev, Shreyas. Ramamurthy, Ramamurthy. Dandapani Purpose: To compare the visual outcomes and higher order aberrations (HOAs) following wavefront optimized (WFO) laser in situ keratomileusis (LASIK) versus [...]

CLINICAL TRIAL RESULTS--show ing functional outcomes with a topography-guided LASIK procedure far surpassed those achieved with previous approaches--have stimulated further study aiming to identify parameters enabling even more consistent delivery [...]

No one walks into Starbucks and says, 'Give me a cup of coffee.' You have to specify tall, grande or venti. You have to ask for room for cream or [...]

Advances in digital technology over the past few decades have fundamentally changed the way we live. Today, use of computers and other digital devices is an indispensable part of our [...]

Though there are many presbyopic astigmats eligible for contact lens wear, and many who would be interested in contact lenses, only about 20% of presbyopic astigmats aged 40 and older [...]

Byline: Manpreet. Kaur, Farin. Shaikh, Ruchita. Falera, Jeewan. Titiyal Toric intraocular lenses (IOLs) are the procedure of choice to correct corneal astigmatism of 1 D or more in cases undergoing [...]

We have seen many changes in multifocal contact lenses in the past decade. Some forward-looking practitioners realize the growth potential with our aging population. Others avoid multifocal contact lenses due [...]

Toric soft lenses, once considered specialty lenses that were fit by only a small percentage of practitioners, have entered the mainstream. Cast molding technology has transformed soft torics from the [...]

Astigmatism is the most common visual error, and many astigmats are successfully fitted with contact lenses. However, toric lenses still are not as widely fitted as many believe they should [...]

Background: The nonsuperimposable mirror-image symmetry of the body (enantiomorphism) is reflected in the wavefront error maps of eyes. Averaging the wavefront errors of right and left eyes has the potential to adversely affect correlations made between wavefront error and visual acuity or other factors. Not only are the results of past studies using Zernike terms suspected of being invalid, there is concern about possible errors in the algorithms used to create customized corneal ablations. Objective: To compare the results of analysis with and without correction for enantiomorphism. Methods: Fourteen TMS-1 corneal topographic maps from 7 patients having with-the-rule astigmatism in both corneas were selected for Zernike decomposition to 45 terms. The maps were distributed among 3 groups: 7 right eye maps, 7 left eye maps, and 7 left eye maps in which the topography was transposed about the vertical axial to correct for enantiomorphism (left eye-corrected). The wavefront error difference between the right and left eyes was compared with the difference between the right eyes and the left eyes in which enantiomorphism was corrected (right eye vs left eye-corrected). The left eye wavefront error was then compared with the left eye wavefront error after correction (left eye vs left eye-corrected). Results: Correcting for enantiomorphism produced a statisticially significant difference in the first 5 radial orders of Zernike terms (P = .02). Of the 45 Zernike terms analyzed, 7 terms were significantly different at the P Conclusions: Correcting for enantiomorphism makes the Zernike terms in right and left eyes appear more similar. Failure to correct for enantiomorphism causes certain terms to cancel each other when averaged across right and left eyes. Wavefront error studies that do not consider enantiomorphism, including those used to adjust laser surgical nomograms, will introduce significant errors to certain Zernike terms. Arch Ophthalmol. 2002;120:439-447

Chances are that many of your presbyopic patients are long-time contact lens wearers, and even some who haven't been are still interested in wearing either bifocal or multifocal lenses. However, [...]

New technology looks great and is exciting to touch, feel, and experiment with. Unfortunately, many optometrists routinely forget about new technology and fall back into our comfort zone with contact [...]

Alcon, the global leader in eye care and a division of Novartis, announces the launch of AcrySof IQ PanOptix Toric presbyopia- and astigmatism-correcting intraocular lens (IOL) for patients with pre-existing [...]

With the introduction of advanced technology intraocular lenses (ATIOLs) almost a decade ago, coupled with the increase in the aging baby boomer population, the demand for optimal quality and quantity [...]

Many patients--and practitioners, for that matter--still hold onto the belief that astigmats and soft contact lenses don't mix. But with the advent of new lens designs and materials, experts say [...]

My patients come to me with a wide variety of eye care issues. Whether I'm prescribing contact lenses or treating an eye-related medical issue, I believe it's important to care [...]

The range of parameters available in the Bausch + Lomb ULTRA[R] Multifocal for Astigmatism lenses--from +4.00 to -6.00D, two add powers, three cylinder powers, and around-the-clock astigmatism correction--is exciting for [...]

Keeping emerging presbyopes in contact lenses has historically been a major challenge for ECPs. There is an inverse relationship between increasing age and use of contact lenses, and, on average, [...]

The contact lens industry has seen an incredible number of advances over the last few years: from novel soft lens materials and optical designs to expanded parameters for correcting astigmatism [...]

Presbyopic astigmats, like presbyopes generally, are interested in contact lens wear. According to one survey, presbyopic astigmats who need multifocal correction express interest in trying multifocal contact lenses, with even [...]