Laser keratomileusis in treatment of anisometropic amblyopia in adults

PURPOSE: To compare and evaluate improvement in corrected distant visual acuity (CDVA) between myopia and hyperopia after laser in situ keratomileusis (LASIK) in adult patients with anisometropic amblyopia. MATERIALS AND METHODS: This prospective clinical study included 103 amblyopic eyes (103 patients), which underwent LASIK correction of refractive error from January 2013 to January 2018. Uncorrected distance visual acuity (UDVA), CDVA, spherical equivalent (SE), postoperative astigmatism, and intraocular pressure were evaluated at time points of 1, 6, and 12 months. RESULTS: Patients were divided into two groups according to refractive error. Group 1: Forty-six patients with myopia and Group 2: Fifty-seven patients with hyperopia. Mean CDVA (logarithm of the minimum angle of resolution [logMAR]) preoperatively was 0.23 ± 0.16 in Group 1 and 0.40 ± 0.19 in Group 2. Postoperative CDVA (logMAR) was 0.17 ± 0.13 in Group 1 and 0.32 ± 0.17 in Group 2. There was statistically significant increase in UDVA (P < 0.0001) postoperatively and no change during the follow-up period of 12 months in both groups. Group 1 showed more expectable results, 95% of variability SE achieved was dependent on SE intended (R(2) = 0.95), while in Group 2, the percentage was slightly lower of expected 87% (R(2) = 0.87). There was statistical significance in respect of CDVA change postoperatively and preoperatively in both groups. Correlation factors are low, in Group 1 r = −0.53 and in Group 2 r = −0.39. CONCLUSION: LASIK can improve CDVA in a considerable portion of amblyopic eyes, both myopic and hyperopic. Eyes with better initial CDVA and those with myopia were associated with greater improvement in postoperative CDVA.