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A comparison of refractive error in post-operative RK and PRK patients

1 November 1997


Approximately 25% of the worlds population are myopic. In the United States Radial Keratotomy (RK) and Photo Refractive Keratectomy (PRK) have emerged as the two most common refractive surgery procedures for the correction of myopia. These two surgeries were the focus of this study. The success rates of both RK and PRK were compared based solely on the resultant uncorrected visual acuity one year following surgery. The subjects included in this study consisted of 38 post-RK patients (50 eyes) and 44 post-PRK patients (50 eyes). Subjects had less than 8.75D of myopia and less than 1.50D of corneal astigmatism The patients were randomly age and refractive error matched and the results analyzed using a two-tailed test. The results of this study found that patients who underwent PRK had statistically significant better one year post-operative uncorrected visual acuity's. Fifty percent of the PRK subjects had unaided acuity of 20/20 or better, while 26% of the RK subjects had unaided acuity of 20/20 or better.


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