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PRK vs transPRK using SCHWIND Amaris® ORK cam: an intrapatient comparative study

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Session Details

Session Title: Surface Ablations for Correction of Ammetropias

Session Date/Time: Tuesday 16/09/2014 | 08:00-10:30

Paper Time: 09:54

Venue: Auditorium

First Author: : J.Gaytan-Melicoff MEXICO

Co Author(s): :    R. Espinosa-Estevez              

Abstract Details


To analyze and compare the benefits, efficacy and safety of these two types of advance surface ablation.


September 2012-2013. Ophthalmology department, cornea and refractive surgery specialist, Hospital Angeles Puebla, Mexico.


A prospective, intrapatient, comparative, randomized, interventional study was conducted; including low to medium myopic and astigmatic eyes, suitable for refractive surgery but not for Laser In Situ Keratomileusis (LASIK), within age range (20-40 years), and no other ocular pathologies. One surgeon (JGM) performed all surgeries, PRK (ethanol 20%) in one eye and TransPRK in fellow eye using dynamic and static cyclotorsion eye tracker recognition. Mitomycin C (0.02%) was used after ablation for 20 seconds in both eyes. Refractive, efficacy and safety outcomes were compared and analyzed at regular postoperative intervals at 1 month and 6 months follow up.


Forty eyes of 20 patients were analyzed, mean age 26±8. Mean pre operative spherical equivalent was -3.64±1.80D for PRK group, and -3.68±1,57D for TransPRK group. Mean post operative spherical equivalent in PRK group and TransPRK group was -0.29±0.46D and -0.10±0.32D subsequently at 1 month, and -0.47±0.72D and -0.28±0.45D subsequently at 6 months follow up. Both procedures were highly effective (PRK 0.93 and 0.84 index, TransPRK 0.97 and 0.91 index, subsequently at 1 month and 6 months follow up). Both procedures were highly safe (=+ 0.99 index at 1 month and 6 months follow up). None of the cases developed post operative haze.


Previous studies of PTK+PRK techniques (all laser refractive surgery) have reported low to mild over correction in myopic and astigmatic patients, compared to regular PRK procedures. In this study we found that Schwind ORKCam TransPRK ablation profile (55µ center and 65µ periphery blended epithelial ablation) had the same (no statistically difference p>0.05) highly effective and safety outcome as PRK procedure at 1 and 6 months follow up. This technique should be considered as a low invasive and highly effective refractive procedure for mild to moderate myopic and astigmatic patients.

Financial Interest:


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