Visual Field Changes After Laser In Situ Keratomileusis In Myopic Eyes

ObjectiveTo evaluate the effects of laser in situ keratomileusis(LASIK) on the patients' central 30-degree visual field.Methods89 eyes of 45 patients with mild, moderate, and high degrees of myopia were undergone LASIK. They were divided into two groups according to the magnitude of the refractive error. Groupâ… (mild and moderate degrees of myopia,60 eyes)-1.5--6.0D, groupâ…¡(high degrees of myopia,29 eyes)-6.0- -10.0 D. Perimetry was performed before and 1 day,1 month,3 months,6 months after LAS1K surgery by Humphreyâ…¡-750 visual field analysis. The central 30-2 fast threshold program was used to examine the change in central 30-degree. Mean defect(MD) and pattern standard deviation(PSD) were record. All operations were performed by an experienced surgeon. Statistical analyses were performed by SPSS using ANOVA(analysis of variance) of repeated measurement data. Differences among variables were evaluated by NPAR(nonparametric test).Results MD of groupâ… andâ…¡had significant differences among preoperative and postoperative values(P<0.05, for all comparisons). PSD of group I did not show significant differences before and after LASIK (P>0.05). While PSD of group II showed significant differences 1 week postoperative values. PSD had no significant differences 1 month,3 months, and 6 months postoperative values.ConclusionThe study suggests that LASIK does not affect the retinal physiological functions of mild, moderate degrees of myopia. While it possibly affects the visual field 1 week postoperative values of high degrees of myopia.