Comparison of corneal higher-order aberrations after sub-Bowman's keratomileusis and femtosecond laser-assisted LASIK for myopia and myopic astigmatism

Session Details

Session Title: Advanced Tools for Outcome Assessment

Session Date/Time: Tuesday 17/09/2019 | 08:30-10:30

Paper Time: 09:44

Venue: Free Paper Forum: Podium 4

First Author: : S.Mahmoud EGYPT

Co Author(s): :    Z. Hassanin   A. Shama                          

Abstract Details

Purpose:

The corneal change induced by refractive procedures influence both the postoperative refractive status and the ocular higher order aberrations. We evaluated changes in corneal total higher order aberrations (HOA), spherical aberrations (SA) and coma after sub-Bowman's keratomileusis (SBK) and Femtosecond laser assisted LASIK (FS-LASIK) for myopia and myopic astigmatism.

Setting:

This a retrospective study. The charts of patients were reviewed postoperatively. All the surgeries were done by the same physicians at a private eye center in Alexandria Egypt.

Methods:

14 eyes (7 patients) were subjected to SBK and 14 eyes (7 patients) to FS-LASIK. Corneal higher order aberrations were measured with the Schwind Sirius aberrometer in all patients both preoperatively and 3 months postoperatively and were compared using Student’s t-test.

Results:

In the FS-LASIK group,the mean preoperative total HOA,SA and coma were 0.23 ±0.08,0.08±0.03 and 0.14±0.07µm.At 3 months,the means were 0.28 ±0.09,0.13±0.03and 0.15 ±0.06µm.There was statistically significant increase in SA at 3 months(P =0.0002)while there was no statistically significant difference in coma and total HOA(P= 0.2&0.6 respectively). In the SBK group,the mean preoperative total HOA,SA and coma were 0.24 ±0.07,0.01 ±0.03 and 0.13 ±0.07 µm respectively. At 3 months,the means were 0.26 ±0.08,0.11 ±0.05 and 0.15 ±0.11µm respectively.There was no statistically significant difference between pre and postoperative values(P=0.32&0.64&0.64 respectively).

Conclusions:

Surgically induced changes in corneal higher order aberrations vary with procedure. higher SA was shown in FS-LASIK than SBK which might be a potentially impact factor for patients’ vision and needs further investigation.

Financial Disclosure:

None