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Thin flaps help avoid overcorrection after LASIK surgery for myopia

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Session Details

Session Title: Presented Poster Session: Keratorefractive Results II

Venue: Poster Village: Pod 2

First Author: : P.Rodrigues PORTUGAL

Co Author(s): :    S. Frazao   S. Cruz   D. Cristovao   M. Marques   H. Nogueira   C. Ornelas

Abstract Details

Purpose:

To analyse the creation of 90μm flaps as a factor to avoid overcorrection in LASIK surgery for myopia. This allows an inferior amount of altered stroma which is seen as a possible contributor for overcorrection.

Setting:

Instituto de Oftalmologia Dr. Gama Pinto.

Methods:

Retrospective study of consecutive cases of LASIK surgery for myopia correction with comparison between eyes that reached emmetropia and over/undercorrected cases, 6 months after the surgery.

Results:

We analysed 400 eyes from 215 patients with a mean age of 32.78 years. Pre-operative spherical equivalent was -3.80D. Surgery was performed with manual microkeratome that allowed the creation of 90μm flaps and mean ablation of the stroma was 63.12μm. Surgical efficacy was 0.89. There were 6 cases (0.015%) of overcorrection higher than 0.50D (max: 1.38D). This group showed a statistically significant difference when compared with the undercorrected one, with higher ablation (67μm vs 65.7μm) and efficacy (0.96 vs 0.83).

Conclusions:

It is thought that deeper ablation may contribute to overcorrection in LASIK surgery for myopia, a situation which may become very dissatisfying for the patient. In our study, the 90μm flaps allowed for a lower amount of altered corneal tissue. That could have been a factor for having few cases of overcorrection when compared to some reports of 2%-17% of consecutive hyperopia. The overcorrection was small and allowed a good efficacy. Interestingly, this group also showed higher stromal ablation, supporting the idea that this variable may contribute for overcorrection.

Financial Disclosure:

NONE

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