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Outcomes of photorefractive keratectomy enhancement on residual refractive error following laser in situ keratomileusis: a cohort study

Poster Details

First Author: A.Iovieno ITALY

Co Author(s):    J. Teichman   S. Low   S. Yeung   M. Legarè   A. Slomovic   D. Rootman

Abstract Details



Purpose:

To analyze the outcomes of photorefractive keratectomy (PRK) on residual myopia and hyperopia post-LASIK, as well as to compare to PRK on eyes without previous laser refractive surgery.

Setting:

Single Center

Methods:

All patients undergoing PRK between 2006 and 2010 were reviewed. Patients were divided into four groups, myopic or hyperopic PRK post-LASIK (mPRK-PL, hPRK-PL) and myopic and hyperopic PRK on corneas without previous laser refractive surgery (mPRK, hPRK). Uncorrected and corrected distance visual acuity (UDVA, CDVA), mean refractive spherical equivalent (MRSE), mean keratometry and aberrations (total, higher order [HOA], coma, trefoil, and spherical aberration) were recorded at month 3 and 6 post-operatively, as well as complications, and attempted versus achieved MRSE.

Results:

Thirty three eyes of 25 patients who underwent PRK post-LASIK (21 eyes of 14 patients for hPRK-PL and 12 eyes of 11 patients for mPRK-PL) and 35 eyes of 21 patients who underwent PRK on virgin eyes (11 eyes of 8 patients for hPRK and 24 eyes of 13 patients for mPRK) were included in the study. The only significant differences in outcomes were found to be HOA at 3 months for hPRK-PL as compared to both hPRK and mPRK. Achieved MRSE was significantly different from expected MRSE for hPRK-PL at 3 months post-op. No haze or flap-related complications were observed.

Conclusions:

Outcomes of PRK were not different in myopic and hyperopic corrections post LASIK and also when compared to PRK in virgin eyes. HOA may render hPRK-PL results less predictable early on. FINANCIAL INTEREST: NONE

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