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Comparison of visual acuity and higher-order aberrations after transepithelial photorefractive keratectomy (t-PRK) and mechanical photorefractive keratectomy (m-PRK)

Poster Details

First Author: O.Olcucu TURKEY

Co Author(s):    Y. Yildirim   A. Agca   E. Ozgurhan   E. Bozkurt   C. Alagoz   A. Demirok

Abstract Details

Purpose:

To compare postoperative visual acuity and higher-order aberrations (HOAs) after transepithelial photorefractive keratectomy (t-PRK) and mechanical photorefractive keratectomy (m-PRK)

Setting:

Beyoglu Eye Education and Research Hospital

Methods:

Medical records of photorefractive keratectomy patients were retrospectively reviewed. Forty five patients were treated with m-PRK. A comparable group of 45 t-PRK 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 12 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.

Results:

The mean preoperative spherical equivalance (SE) was -2.43 ± 1.21 in the m-PRK group and -2.56 ± 1.32 in the t-PRK group. One year after surgery, the mean SE was -0.28 ± 0.35 in the m-PRK group and -0.21 ± 0.40 in the m-PRK group (p=0.86). In m-PRK group a greater number of eyes were within ±0.50D of the target refraction (95% versus 85%); but, the difference was not statistically significant (p=0.20).90% of t-PRK eyes and 95% of m-PRK eyes had an uncorrected distance visual acuity of 20/25 or better (p=0.40). Total HOAs, spherical aberration, coma and trefoil increased postoperatively.

Conclusions:

t-PRK and m-PRK result in comparable refractive results.Corneal aberrations induced by different techniques of photorefractive keratectomy seemed similar to each other.

Financial Disclosure:

NONE

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