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Higher order aberration change after customized femtolaser-assisted LASIK vs laser-assisted subepithelial keratectomy for the correction of high myopia and astigmatism

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Session Details

Session Title: Surface Photoablation

Session Date/Time: Sunday 06/09/2015 | 16:30-18:00

Paper Time: 17:12

Venue: Room 10

First Author: : S.Hashemian IRAN

Co Author(s): :                        

Abstract Details


To compare the higher-order aberrations (HOAs) changes after Wave front guided (WF-G) FA- LASIK versus WF-G LASEK in the treatment of high myopia and astigmatism.


Eye research Center ,Rassoul Akram hospital, Iran University of medical sciences and Iranian Eye Clinic and Laser Center, Tehran- Iran.


A prospective comparative case series study comprised 114 eyes of patients with spherical component greater than -6.00 diopters (D) and cylinder lower than -3.00 D were assigned to 2 groups: 47 eyes were treated with FA-LASIK and 67 eyes with LASEK. Total RMS and HOAs value changes, Vertical and horizontal coma and spherical aberration were measured for each patient using a Shack-Hartmann wave- front sensor (Zywave, Bausch & Lomb, Rochester, NY) over a 6-mm pupil preoperatively and 6 months postoperation.


Preoperatively the mean refractive spherical equivalent (MRSE) was -7.12 ±1.47D in FA-LASIK group and -6.97 ±. 96 D in LASEK group, at 6 months it was -.27 ±. 41and -.05±. 51 respectively. At 6 months, there were no any statistically significant differences in term of UCVA P=. 13, DCVA P=. 65, Total RMS value P=. .29. The mean Total HO-RMS value at 6 mm pupil were .360m in LASIK and .361m in LASEK group that increased to .614m and .711m respectively P=0.05. Vertical coma P=. 005 and Spherical aberration p=. 000 were increased significantly in LASEK group.


Both customized WF-G FA-LASIK and LASEK were safe and effectively treated eyes with high myopia and astigmatism. HOAs value increased significantly more in LASEK group.

Financial Interest:


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