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Denise S. Ryan, Rose Kristine Sia, Dawne M Deaver, Tana Maurer, Christopher L Howell, Lorie A Logan, Jennifer B Eaddy, Joseph F Pasternak, Richard Stutzman, Kraig S Bower; Visual outcomes and the identification of static and dynamic targets of military interest after Wavefront-guided (WFG) and Wavefront-optimized (WFO) Photorefractive Keratectomy (PRK). Invest. Ophthalmol. Vis. Sci. 2014;55(13):1522.
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To evaluate the visual outcomes and the ability to identify static and dynamic targets of military interest after WFG and WFO PRK.
In this prospective randomized study, 27 myopic military personnel underwent either WFG (n=14) or WFO PRK (n=13). Subjective manifest refraction, uncorrected and corrected distance visual acuities (UDVA and CDVA) were measured preoperatively and at 1, 3, and 6 months postoperatively. Performance on military tasks was determined before and after refractive surgery. Participants were evaluated for their ability to discriminate vehicles and handheld objects of military interest. Change in probability of identification (PID) of the two target sets at different ranges was assessed at preop and 6M postop for each participant. The Fisher exact test was used to compare visual outcomes and military task performance between the treatment groups. A p-value of <0.05 was considered statistically significant.
At 6 months postop, 100% WFG PRK versus 95.8% WFO PRK treated eyes achieved UDVA ≥20/20. There were 96.4% WFG PRK compared to 92.3% WFO PRK eyes maintaining manifest spherical equivalent ±0.5 diopters of emmetropia. None lost more than 2 lines of CDVA. For handheld object ID, at 6M, 9 of 10 WFG PRK and 9 of 10 WFO PRK subjects performed equivalent to or better than preop performance (p=0.99). There was 1 subject in each group who performed more than one standard deviation (1σ) below preop PID. For military vehicle ID, at 6M, 10 of 11 WFG PRK subjects performed equivalent to or better than preop performance while 9 of 10 WFO PRK subjects performed equivalent to or better at 6M (p=0.99). There was 1 subject in each group who performed more than one standard deviation (1σ) below preop PID.
Comparing WFG and WFO PRK 6M postoperatively, visual outcomes were favorable in both groups. Changes in military task performance for ID of vehicles and handheld objects were statistically equivalent between the treatment groups.
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