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A comparison of 6.0, 6.5 and 7.0 mm optical zones in hyperopic laser in situ keratomileusis

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Session Details

Session Title: Presented Poster Session: Laser Refractive Surgery

Session Date/Time: Sunday 06/09/2015 | 15:00-16:30

Paper Time: 15:30

Venue: Poster Village: Pod 2

First Author: : M.Mimouni ISRAEL

Co Author(s): :    I. Vainer   Y. Shapira   S. Levartovsky   T. Sela   G. Munzer   I. Kaiserman

Abstract Details


To compare the long-term efficacy, accuracy and safety of hyperopic laser in situ keratomileusis (LASIK) using three different optical zone diameters.


This retrospective study included patients who underwent laser in situ keratomileusis (LASIK) between January 2000 and October 2014 at the Care-Vision Laser Centers, Tel-Aviv, Israel.


This study included all hyperopic patients that underwent LASIK with a 6.0, 6.5 or 7.0 mm optical zone diameter.


Overall, 2,516 eyes of 1,258 patients met inclusion criteria. The 7.0 mm group had a significantly lower safety index when compared to the 6.0 and 6.5 mm groups (0.86 ± 0.36, 0.95 ± 0.18, 0.94 ± 0.21 respectively, p<0.001). A finding that remained significant in stepwise multiple regression analysis. The optical zone 6.5 mm group had a significantly higher efficacy index and lower distance from target in univariate analysis (p=0.01 and p<0.001 respectively), however, these findings did not remain significant in stepwise multiple regression analysis (p=0.13 and p=0.12 respectively).


Although a larger optical zone provides similar rates of efficacy and accuracy in hyperopic LASIK, it is inferior in terms of safety. Therefore caution is warranted before using an optical zone diameter larger than 6.5 mm in hyperopic LASIK.

Financial Interest:


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