The remote results of myopia correction by photorefractive keratectomy method in patients with initially thin cornea

Poster Details

First Author: I.Dutchin RUSSIA

Co Author(s):                  

Abstract Details

Purpose:

Analysis of changes of visual acuity (VA) and keratotopografical parameters of a cornea in the remote period after photorefractive keratectomy at patients with myopia of various degree at initially thin cornea (500 microns and less).

Setting:

State Institution Eye Microsurgery Complex named after S.N. Fyodorov, the Khabarovsk Branch, Rissia.

Methods:

The analysis of the remote results of excimer-laser surgery of 120 patients (240 eyes) with stabilized myopia of average and high degree (terms of supervision of 5-6 years) is carried out. Earlier to all of them has been executed trans-epithelial photorefractive keratectomy on excimer-laser installation " Mikroskan" . Middle age of surveyed patients at the moment of operation has made 28.2±5.6 year. There were 46 males, 74 females. Myopia of medium degree took place in 146 eyes: the refraction, on averaged, was -4.18±1.2 D (dioptres). Myopia of high degree took place in 94 eyes: the refraction, on averaged, was -7.66±1.5 D. The average thickness of a cornea has made 497±24.6 micron. After operation all patients received the standard treatment accepted in our clinic with instillation of 0.1% dexamethasone solution according to the decreasing scheme. Visual acuity measurement and keratotopografical cornea research was spent to all patients before, after operation and in the remote period (5-6 years) after photorefractive keratectomy.

Results:

Indicators of visual acuity without correction in the early postoperative period and in 5-6 years after photorefractive keratectomy at patients with myopia of medium degree haven't changed practically: 0.97±0.03 and 0.93±0.05 accordingly. At patients with myopia of high degree the average indexes of visual acuity without correction have changed more considerably: 0.82±0.05 and 0.51±0.05 accordingly. The average thickness of a cornea after operation has made 457±21.3 micron at patients with myopia of medium degree and 423±23.7 micron at patients with myopia of high degree. Throughout all period of supervision these parameters remained stable. By data of keratotopography there was not revealed changes of keratoconus, superficial asymmetry index (SAI) and a surface regularity index (SRI) were within norm.

Conclusions:

1. Carrying out of photorefractive keratectomy provides high functional result at myopia of various degree with the minimum quantity of complications. 2. In the remote period after photorefractive keratectomy (5-6 years) indicators of visual acuity without correction are slightly lowered at patients with myopia of high degree. 3. Keratectasia hasn't arisen in one case after photorefractive keratectomy, postoperative keratotopografical cornea parameters are stable throughout all the period of observation. FINANCIAL DISCLOSURE?: No