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Comparison of visual acuity and higher-order aberrations after photorefractive keratectomy (PRK) and small-incision lenticule extraction (SMILE)

Poster Details

First Author: Y.Yildirim TURKEY

Co Author(s):    O. Olcucu   A. Agca   E. Ozgurhan   C. Alagoz   E. Bozkurt   A. Demirok

Abstract Details


To compare postoperative visual acuity and higher-order aberrations (HOAs) after photorefractive keratectomy (PRK) and after small-incision lenticule extraction (SMILE).


Beyoglu Eye Training and Research Hospital


Medical records of refractive lenticule extraction patients were retrospectively reviewed. Twenty-five patients were treated with PRK. A comparable group of 25 SMILE patients were retrospectively identified. Only one eye of each patient was randomly chosen for the study. Visual acuity, subjective manifest refraction and corneal topography before and 6 months after the surgery were analyzed for both groups. Total HOAs, spherical aberrations, coma and trefoil were calculated from topography data over the 4- and 6-mm-diameter central corneal zone.


The mean preoperative SE was -3.26±1.02 in the SMILE group and -3.16±1.26 in the PRK group. Six months after surgery, the mean SE was -0.28±0.35 in the SMILE group and -0.30±0.21 in the PRK group (p=0.6). In the SMILE group a greater number of eyes were within ±0.50 D of the target refraction (85% versus 80%); however, the difference was not statistically significant (p=0.24). . Total HOAs, spherical aberration, coma and trefoil increased postoperatively in both groups.


PRK and SMILE result in comparable refractive results. In addition, corneal aberrations induced by different techniques of lenticule extraction seemed similar to each other.

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