SMILE: an alternative method of complex myopic astigmatism correction

Session Details

Session Title: SMILE for Myopia II

Session Date/Time: Wednesday 17/09/2014 | 08:00-09:30

Paper Time: 09:06

Venue: Capital Hall B

First Author: : O.Pysarevskaya RUSSIA

Co Author(s): :    A. Shchuko   V. Bukina   T. Iureva        

Abstract Details

Purpose:

To evaluate the clinical efficacy of Smile surgical procedures with optimization of calculations for the correction of complex myopic astigmatism.

Setting:

Irkutsk Branch of S. Fyodorov Eye Microsurgery Federal State Institution, Irkutsk State Medical University

Methods:

The study included 47 patients (94 eyes) operated by Smile method. Age ranged from 19 to 37 years; mean age - 24±2, 1 years. The ratio: 34 women (72%) / 13 men (28%). In all cases, medium and high myopia combined with astigmatic. Preoperative uncorrected visual acuity was 0, 07±0, 02, corrected visual acuity was 0, 93±0, 04, preoperative spherical refractive component was -5,7±0,11 diopters (-0.5 to -9.25), cylindrical component was -2, 09±0, 08 diopters (-0.5 To -5.0). To assess changes in the corneal parameters and visual function all patients received a standard ophthalmic examination before and after surgery with multiplicity 1 day, month and 3 months. Corneal status was assessed by the scan of anterior eye chamber Sheimpflug «Pentacam».

Results:

Intraoperative and postoperative complications were not observed. In all patients the day after surgery monocular and binocular uncorrected distance visual acuity was for certain higher (0,79±0,12) and (0,87±0,09), but the maximum visual acuity was achieved in three months (1,02±0,03) and (1,13±0,02) and even in most cases exceeded the values of corrected visual acuity in the preoperative period. Spherical component was the first day after surgery +0, 38±0, 04 diopters, cylindrical one -0, 47±0, 02 diopters. By three months the spherical component was +0,03±0,01 diopters, cylindrical one was -0,25±0,01 diopters. When calculating SMILE surgical parameters in patients with myopia and astigmatism the original conversion to the side of hypercorrection of cylindrical component, depending on the degree of astigmatism, was applied. This calculation method is based on the increase in value of the cylindrical component by 9-11% percent of the initial indices. It should be noted that in the first days after surgery there was a slight hyperopic shift of spherical component according data of refractometry, which gradually leveled off in the first month.

Conclusions:

The analysis of data, using the suggested calculations, allows regarding the SMILE femtosecond technology in patients with concomitant refractive pathology as effective and safe method for correction the refractive errors. The proposed calculation of the cylindrical component enables expansion of the indications for SMILE technology using.

Financial Interest:

NONE