A Comparative Study Measuring Vertical Coma Between Patients Undergoing Smile Surgery On Visumax 800 Versus Visumax 500

To compare amount of vertical coma aberrations in patients undergoing SMILE surgery on Visumax 500 and Visumax 800 

Nethradhama Superspeciality Eye Hospital Bangalore

A total 128 eyes, 64 each from patients undergoing SMILE surgery on Visumax 500 and Visumax 800 were included. Patients were examined for UCVA, manifest refraction, slit lamp examination , Pentacam, MS 39, A.TLAS topography, ITrace, HD Analyser, WASCA aberrometery at pre operatively and post operatively at day 1 , 15 & 3 months

INCLUSION: 1. Patients with myopia <10D 2. Patients with Myopic Astigmatism SE <10D

EXCLUSION: 1. Corneal opacity, inflammatory conditions of the cornea or Evidence of acute or chronic corneal infection. 2. Cataractous changes in crystalline lens. 3. Angle kappa >0.5mm

SMILE surgery was performed using VISUMAX 800 in 1 group and VISUMAX 500 in other group.

It was observed that the total mean vertical coma aberration induced at post op 3 months was 0.020+/-0.052 in patients who underwent SMILE surgery on the Visumax 500 and -0.029+/-0.060 in those who underwent the surgery on Visumax 800. The results were also compared based on the angle kappa values in both groups. In the Visumax 500 group, <0.3 angle kappa had a mean vertical coma of 0.022+/-0.054 and that >0.3 angle kappa comprising 16 eyes had a mean value of vertical coma of 0.013 +/- 0.047 at post op 3 months. In the Visumax 800 group, vertical coma mean value in <0.3 angle kappa was -0.032+/-0.063 and that >0.3 angle kappa was -0.009+/-0.031. These values were statistically significant.

This study demonstrates that SMILE surgery performed with Visumax 800 results in lower vertical coma aberration compared to the Visumax 500. additionally , the OSI values observed were lesser in Visumax 800 suggesting improved optical quality.