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Clinical Outcomes of a New Asymmetric Intracorneal Ring Segment for the Treatment of Keratoconus
- Source :
- Cornea. 38:1228-1232
- Publication Year :
- 2019
- Publisher :
- Ovid Technologies (Wolters Kluwer Health), 2019.
-
Abstract
- PURPOSE To report visual, refractive, and corneal aberrations after implantation of a new asymmetric intracorneal ring segment (ICRS). METHODS This was a prospective, multicenter clinical study including 30 eyes of 26 patients with keratoconus. All cases were implanted with an ICRS, named the VISUMRING (VR), which had an arc length of 353 degrees and 2 asymmetric sections that can be customized in base width, length, and thickness. Ophthalmic evaluation included uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), refraction, topography, and anterior corneal aberrations using the Sirius System (CSO, Firenze, Italy). Mean follow-up period was 14.7 ± 7.9 months. RESULTS Significant improvement of both UDVA and CDVA was observed after 1 year. UDVA improved from 0.08 ± 0.22 to 0.22 ± 0.16 and CDVA from 0.24 ± 0.29 to 0.43 ± 0.18 (P = 0.01). A significant reduction of more than 7 D in the spherical equivalent from -12.38 ± 3.77 D to -5.00 ± 3.26 D (P < 0.05) was noted 1 year after the procedure. In terms of higher-order aberrations, a slight reduction that was not statistically significant in the higher-order and coma-like aberrations was noted at 1 year from 4.32 and 3.82, to 4.12 and 3.55, respectively. Regarding complications, 5 of the 30 cases needed to have the VR explanted throughout the follow-up period due to severe corneal melting. CONCLUSIONS VR ICRS improves vision and refraction and induces major corneal flattening in patients with keratoconus. Further design enhancement is needed to increase the reduction of the asymmetric corneal aberrations and reduce the extrusion rate.
- Subjects :
- Adult
Male
Corneal melting
Keratoconus
medicine.medical_specialty
Time Factors
Visual acuity
Distance visual acuity
Adolescent
genetic structures
Corneal Stroma
Visual Acuity
Spherical equivalent
Ophthalmologic Surgical Procedures
Prosthesis Design
Refraction, Ocular
Prosthesis Implantation
Young Adult
03 medical and health sciences
0302 clinical medicine
Ophthalmology
medicine
Humans
In patient
Prospective Studies
Intracorneal ring segment
medicine.diagnostic_test
business.industry
Corneal Topography
Middle Aged
medicine.disease
Corneal topography
eye diseases
Treatment Outcome
030221 ophthalmology & optometry
Female
medicine.symptom
business
030217 neurology & neurosurgery
Follow-Up Studies
Subjects
Details
- ISSN :
- 02773740
- Volume :
- 38
- Database :
- OpenAIRE
- Journal :
- Cornea
- Accession number :
- edsair.doi.dedup.....3e520ee3f4ef0e0c30681072da680f76
- Full Text :
- https://doi.org/10.1097/ico.0000000000002062