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Vienna 2018 Delegate Registration Programme Exhibition Virtual Exhibition Satellites 2018 Survey


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Keratorefractive surgery: a comparison of optic zone diameters

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Session Details

Session Title: Surface Photoablation/PRK

Session Date/Time: Tuesday 25/09/2018 | 14:00-16:00

Paper Time: 14:06

Venue: Room A3, Podium 2

First Author: : L.Karmona ISRAEL

Co Author(s): :    M. Mimouni   I. Vainer   T. Sela   G. Munzer   I. Kaiserman        

Abstract Details


To compare the efficacy, safety and accuracy of laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK) with different optic zone (OZ) diameters.


Care-Vision Laser center Institute, Tel-aviv, Israel,


A retrospective study of consecutive eyes that underwent hyperopic LASIK, myopic PRK or myopic LASIK surgery between January 2012 and December 2016 at the Care-Vision Laser Centers, Tel-Aviv, Israel. Each surgical category was divided into 3 groups according to the diameter of the treated OZ (6.0, 6.5, 7.0 mm). Within each category, groups were compared for refractive and visual outcomes at 3 to 6 months following surgery


In hyperopic LASIK (n=594), OZ 6.0 mm demonstrated a significantly higher efficacy index , accuracy (p=0.001) and lower percent of post-operative haze (p=0.01). In myopic LASIK (n=4217), OZ 6.5 mm demonstrated a significantly higher efficacy index (p=0.001) and higher percent of post-operative dry eye (p=0.03). In myopic PRK (n=5631) OZ 7.0 demonstrated a significantly higher safety index (p=0.03), higher accuracy (p=0.03) and lower percent of post-operative haze (p=0.002). However, in multivariate analysis 6.0 mm OZ demonstrated significantly better results in all the techniques (LASIK\PRK) and refractive status (myopia\hyperopia) groups.


The ideal OZ diameter is 6.0 mm and it does not differ between techniques (LASIK\PRK) and refractive status (myopia/hyperopia)

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