Retreatment after initial laser in situ keratomileusis

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Abstract
S: The prospective study included 157 eyes of 108 patients. Using the VISX Star laser, retreatments were performed for undercorrection in 43 eyes (27%) and for regression in 114 eyes (73%). The mean follow-up was 15 months (range 6 to 28 months) after the initial surgery and 10 months (range 3 to 25 months) after the repeat LASIK procedure. Results: Overall, the mean spherical equivalent (SE) was −6.11 ± 2.35 diopters (D) (range −1.87 to −15.00 D) before LASIK and −1.28 ± 0.57 D (range −0.50 to −3.25 D) prior to retreatment. At the last visit, it was −0.23 ± 0.41 D (range −2.55 to 1.13 D). One hundred fifty-three eyes (97.5%) were within ±1.00 D of emmetropia and 128 (81.5%), within ±0.50 D. The uncorrected visual acuity was 20/20 or better in 68.8% of eyes and 20/40 or better in 98.1%. In all eyes, the best corrected visual acuity (BCVA) improved or remained within 1 line of the pre-revision level. However, 2 eyes (1.3%) lost 2 or more lines of pre-initial LASIK BCVA. Both eyes had a preoperative SE greater than −8.00 D; corneal irregularity was the cause of the decrease in vision. Conclusions: Several conclusions can be drawn from this study. First, LASIK retreatment is effective and safe for correcting undercorrection and regression after initial LASIK, and a good visual outcome is expected. Second, in most eyes, regression occurs within 6 months after the initial LASIK. However, regression can develop up to 2 years after LASIK. Third, multiple retreatments will be required in some patients. The outcome in these cases is promising....