• We compiled three-year and longer follow-up data on 198 consecutive radial keratotomy surgeries performed by one of us (H.S.). Follow-up was obtained on 138 (70%) of these eyes. Results were compared with previously published two-year results. The mean spherical equivalent before surgery was −4.3 diopters, the average keratometry value was 44.11 D, and 75% of the eyes had an uncorrected distance acuity of 20/400 or more. The average change in the spherical equivalent was 3.74 D for eyes examined at three years, compared with 3.71 D for eyes examined at 18 months. Average keratometry value was 40.96 D after three years, compared with 41.16 D at 18 months. Uncorrected visual acuity was at least 20/40 in 73% of eyes examined after three years, as opposed to 72% at 18 months. For eyes examined at both 18 months and three years, the increase in spherical equivalent of 0.17 D was statistically significant, as was the decrease in average keratometry value of 0.20 D. Uncorrected visual acuity results were stable between 18 months and three years.
Sawelson H, Marks RG. Three-Year Results of Radial Keratotomy. Arch Ophthalmol. 1987;105(1):81-85. doi:10.1001/archopht.1987.01060010087037