Effect Of Glare On Contrast Sensitivity In Subjects Implanted With Diffractive And Diffractive-Refractive Trifocal Intraocular Lens

To assess the effect of glare on contrast sensitivity in subjects implanted with diffractive and diffractive- refractive IOLs.

Private Tertiary Eye Care Hospital, Mumbai, India.

Its a retrospective study where subjects implanted with diffractive trifocal (Acrysof IQPanOptix, Alcon) and diffractive refractive trifocal (Optiflex Trio, Biotech), aged between 40-70 years and best corrected visual acuity better than 0.1 logMAR were enrolled. Subjects with intra operative complications, ocular disease were excluded. Effect of glare on contrast sensitivity was measured at post operation 1 month ± 7 days using CSV- 1000 HGT (Vector Vision). Contrast sensitivity at 4 spatial frequencies (3,6,12 and 18 cycles per degree (CPD)) measured with and without automatically calibrated glare sources and were analyzed.

One hundred and fifty five eyes and 80 eyes were implanted with PanOptix, and Trio IOL respectively. The Mean±SD age of the subjects implanted with Trio and Panoptics IOL were 57.79±6.70 and 59.76±7.15 years respectively. The mean contrast sensitivity with and without glare was similar in both the IOLs at 3, 6, and at 12 cycles per degree (p>0.05). However the mean contrast was found to be significantly reduced in the presence of glare at 18 cycles per degree in both Panoptics (paired t test, p=0.04) and trio IOL (paired t test, p=0.02). 

Overall contrast sensitivity with and without glare at low and intermediate spatial frequencies was found to be similar in both the IOLs however  there was significant reduction in contrast sensitivity with glare at higher spatial frequencies.