Long term followup for contrast sensitivity and glare sensitivity in cataract patients treated with aspherical and spherical intraocular lenses

Objective To compare long term visual acuity,contrast sensitivity and glare sensitivity after implantation of the aspherical intraocular lens(IOL) in age-related cataract patients,and to evaluate the safety and the effectiveness of the aspheric intraocular lens.Methods A prospective study of 120 consecutive cases(161 eyes) was conducted.All cataract patients underwent phacocoemulsification were randomized to receive three IOL types:Alcon AcrySof IQ(47 cases 54 eyes),KS-3Ai(46 cases 52 eyes),and AcrySof? Natural(42 cases 55 eyes),follow-up over than six months.The following investigation were performed to assess the best corrected distance visual acuity(BCDVA),contrast sensitivity,glare sensitivity and complications.Statistical analyses were performed using analysis of variance(ANOVA),paired-sample T test and analysis chi(2).Results BCDVA with AcrySof IQ,KS-3Ai and AcrySof? Natural IOL was similar after 1 week,1 month and more than 6 months(P =0.874,P=0.243,P=0.160).In addition,more than 6 months post operatively,the group aspherical demonstrasted significantly higher CS at 1.5c/d、3.0 c/d、6.0 c/d during mesopic testing(P=0.004,P=0.040 P=0.050,respectively);and higher GS at 1.5c/d、3.0 c/d、6.0 c/d in mesopic with glare(P=0.009,P=0.031,P=0.036,respectively);similar in photopic condition;at all spatial frequencies in all conditions,CS and GS were similar between the aspherical(P〉0.05).Conclusion Long term curative effect shows that the aspherical intraocular lens tend to offer better visual acuity,improve CS and GS,especially in the mesopic conditions.