Laser in situ keratomileusis for best corrected visual acuity was equal to or below 0.5

Objective To evaluate the visual acuity and refractive results of laser in situ keratomileusis(LASIK)in patients with best corrected visual acuity(BCVA)was equal to or below 0.5,and to assess the predictability and efficacy of the procedure.Methods 48 patients(65 eyes)with BCVA was equal to or below 0.5 had LASIK.Preoperative BCVA ranged from 0.02 to 0.5(median,0.44).All patients completed a minimum follow-up of 12 months.Results One year after LASIK,uncorrected visual acuity(UCVA)improved in all eyes.Postoperative UCVA ranged from 0.02 to 1.0.Postoperative UCVA exceeded preoperative BCVA significantly(t=3.092,P=0.003).There was a significant exceeding of postoperative BCVA compared with that of UCVA by one to more than three lines.The safety index was 1.31(P0.001).The efficacy index was 1.18(P0.05).There were no significant complications.Conclusions Patients with ametropia,esp.high myopia or anisometropia,should be provided a corrected glasses or contact lens in time.LASIK was effective for correction of lower corrected visual acuity and providing good visual results.