Posters

Are the results of repeat PRK as good as primary PRK?

Poster Details

First Author: M.Mimouni CANADA

Co Author(s):    I. Kaiserman                    

Abstract Details

Purpose:

To compare the refractive outcomes of primary and repeat photorefractive keratectomy (PRK) for myopia.

Setting:

Care-Vision Laser Centers, Tel-Aviv, Israel

Methods:

This retrospective comparative study consisted of the right eyes of consecutive myopic patients undergoing primary or repeat PRK between January 2013 and December 2016. The primary and repeat PRK groups were matched for preoperative age, gender, spherical equivalence, sphere, astigmatism, uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA). The primary outcomes were postoperative UCVA, BCVA, efficacy index, safety index and distance from target.

Results:

The matched primary and repeat PRK groups comprised 110 eyes of 110 patients each. Both groups were adequately matched in terms of preoperative age, spherical equivalence, sphere, cylinder, logMAR UCVA and logMAR BCVA (p>0.05 for all. Following surgery the primary PRK group had superior logMAR UCVA (0.01 versus 0.05, p=0.001) and efficacy index (1.02 versus 0.95, p=0.005) with a similar logMAR BCVA (0.01 versus 0.02, p=0.20) and safety index (1.02 versus 1.01, p=0.48). The primary PRK group had a higher proportion within ±0.5D spherical equivalence (72.3% versus 56.5%, p=0.001) and cylinder (72.3% versus 57.7%, p=0.036).

Conclusions:

Despite demonstrating similar safety index, repeat PRK leads to reduced efficacy and greater distance from target when compared to primary PRK. Unique nomograms for repeat PRK may be warranted.

Financial Disclosure:

None