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PRK might be better for extreme myopia than LASIK

Poster Details

First Author: S.Holland CANADA

Co Author(s):    D. Lin   M. Al Obthani   S. Arba Mosquera   K. Termote           

Abstract Details


Comparing one-year outcomes of extreme myopia cases between PRK and LASIK


Private Laser Refractive Clinic


Retrospective and consecutive case series. Chart review of 251 eyes with more than -10.00D spherical equivalent (SE) preoperatively that underwent laser refractive surgery with Schwind Amaris SmartSurfACE excimer laser. 198 eyes were treated via trans epithelial PRK and 53 were treated via LASIK. One year postoperative uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction (MR), predictability and complications were evaluated and compared.


36% (72/198) PRK patients showed UDVA ≥20/20 compared to 23% (12/53) LASIK patients. 59% (117/198) PRK patients had no change in CDVA compared to 64% (34/53) LASIK patients, 14% of patients in both groups lost one line (27/198 and 7/53 respectively). 64% (126/198) PRK patients showed postoperative SE +/- 0.50D compared to 60% (32/53) LASIK patients. Mild complications occurred such as temporary loss of vision due to punctate keratopathy on 4% (7/198) PRK patients compared to 23% (12/53) LASIK patients (P<0,05), and early haze formation on 3% (5/198) PRK patients compared to 0% (0/53) LASIK patients (P>0,05).


In extreme myopia, more patients achieved 20/20 UDVA with PRK than LASIK. However this result was not significant. PRK for extreme myopia appears to be non-inferior to LASIK with potentially higher safety.

Financial Disclosure:

is employed by a for-profit company with an interest in the subject of the presentation, travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented

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