PRK corrects myopia with high predictability up to 19 years postoperatively
Eyes with low myopia had better refractive stability than eyes with high myopia up to 19 years after PRK, according to a study.
The retrospective study included 160 eyes that were treated with PRK for myopia between 1992 and 1998. Ablation was performed at the 5-mm to 6.5-mm optical zones with the Summit broad-beam excimer laser (Summit Technology). Eyes that were re-treated were not included.
Mean age at the time of surgery was 26.1 years. Mean follow-up was 16.7 years (range: 14 years to 19 years).
Uncorrected distance visual acuity was 20/40 or better in 97% of eyes at 3 months, 96% at 6 months and 79% at final follow-up (P < .001).
Uncorrected distance visual acuity was 20/20 or better in 45% of patients with low myopia and 22% of those with high myopia at final follow-up; the between-group difference was statistically significant (P = .020).
Refraction was within 1 D of the target in 72% of eyes with low myopia and 47% of eyes with high myopia.
Residual refractive error was mainly attributed to myopic progression.
Eighty-one percent of patients were satisfied with surgical outcomes, the authors said.