Abstract: Objective To explore the clinical effect and postoperative visual function of phacoemulsification combined with bifocal intraocular lens implantation in the treatment of senile cataracts. Methods Fifty-nine patients(118 eyes)with senile cataracts were treated by phacoemulsification combined with intraocular lens implantation. The patients were divided into two groups according to the type of intraocular lens implantation: the bifocal group and the monofocal group. Three months postoperatively, the uncorrected distant vision, near vision, and near stereopsis were recorded at random. The contrast sensitivity in different spatial frequencies(1, 2, 5, and 10 cpd)in a dark environment was measured, and the defocus curve was drawn. A subjective questionnaire(VF-14-CN scale)was conducted to count the rate of off-glasses, and whether there was glare and halo at night. Results Compared with the monofocal group, postoperative satisfaction was superior in the bifocal group in terms of the uncorrected near visual acuity, distance-corrected near visual acuity, glasses detachment rate, and near stereopsis function(all P<0.05). However, there was no significant difference in corrected distance visual acuity and uncorrected distance visual acuity(P=0.164,P=0.699). When the spatial frequency was 10 cpd, the contrast sensitivity of the left and right eyes in the bifocal group was lower, and the difference was statistically significant(P=0.002,P=0.037). Nocturnal halo occurred in both groups and the difference was statistically significant(P<0.001). Glare discomfort was also common in both groups but the difference was not statistically significant(P=0.148). Conclusion AT LISA 809M bifocal intraocular lens can help patients with senile cataracts achieve better near visual acuity, near stereopsis vision, and overall satisfaction compared with Proming A1-UV monofocal intraocular lens.

Key words: Focus curve, Near stereopsis vision, Contrast sensitivity, Visual quality, Bifocal intraocular lens