Hyperopic laser in situ keratomileusis to treat overcorrected myopic LASIK

Abstract

Purpose To evaluate the safety and efficacy of hyperopic laser in situ keratomileusis (LASIK) in treating hyperopia caused by overcorrected myopic LASIK and to evaluate a new technique to place the hyperopic treatment after lifting the initial myopic flap. Setting Open-access outpatient excimer laser surgical facility. Methods A retrospective analysis was performed of 54 eyes in 47 patients who had spherical hyperopic LASIK by 21 surgeons for the treatment of significant hyperopia after overcorrected LASIK for myopia. In 42 eyes, the initial LASIK flaps were lifted and in 12 eyes, new flaps were cut. The mean age of the 25 men (53%) and 22 women (47%) was 48.2 years ± 8.4 (SD). Outcome measures included refractive error, uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), and complications. The mean follow-up was 2.97 months. Results In eyes in which postoperative emmetropia was attempted (n = 45), the mean spherical equivalent improved from +1.21 ± 0.49 diopters (D) preoperatively to –0.38 ± 0.50 D postoperatively ( P < .001). The mean UCVA improved from 20/38.6 ± 16.3 to 20/27.4 ± 9.4 ( P < .001). At the last follow-up, 69% of eyes were within ±0.5 D and 96% were within ±1.0 D of emmetropia; 42% had a UCVA of 20/20 and 96% had a UCVA of 20/40 or better. No eyes lost 2 or more lines of BSCVA. No vision-threatening complications occurred. Results in patients who had initial flaps lifted and those who had new flaps cut were statistically indistinguishable. On average, achieved hyperopic corrections were 18% greater than intended. Conclusion Hyperopic LASIK was safe, predictable, and effective in the treatment of hyperopia caused by overcorrected myopic LASIK. Results were similar whether the original flap was lifted or a new one was cut.