Attenuating glare disability and photostress through the addition of a blue-light filter

Session Details

Session Title: IOL technology/New IOLs etc.

Session Date/Time: Saturday 13/09/2014 | 08:30-10:30

Paper Time: 09:04

Venue: Boulevard A

First Author: : B.Hammond USA

Co Author(s): :    M. Venkiteshwar              

Abstract Details

Purpose:

To evaluate the effects of filtering short wavelength light on visual performance under intense light conditions among pseudophakes previously implanted with a clear intraocular lens (IOL).

Setting:

This prospective, subject-masked study was conducted across 6 US sites.

Methods:

155 pseudophakes previously implanted with an IOL largely transparent to visible light were recruited. Photostress recovery time (PRT) and disability glare thresholds were measured on all subjects with a clip-on blue light filter (BLF) and placebo (no blue light filtration) filter. Photostress recovery time was quantified as the time necessary to regain sight after exposure to a 10-deg circular broad-band white at ~4.5 logTrolands. Disability glare threshold was defined as the intensity of a white-light annulus (10-deg diameter) necessary to obscure a central grating target. The order of filter used and test eye was randomized across the subjects.

Results:

Photostress recovery time was significantly faster with the addition of the BLF (5.66±6.2 s) compared to placebo filter (6.94±7.16 s, p=.0001). The difference in PRT was 1.37±4.32 seconds with 95% confidence interval from 0.6 to 2.08 seconds. Glare disability threshold was significantly higher with the BLF (1.37±0.88 log unit) compared to placebo filter (1.26±0.92 log unit, p=.0001). The difference in PRT was 0.12±0.38 log unit with 95% confidence interval from 0.06 to 0.18 log unit. Visual acuity and pupil function did not change with the addition of BLF compared to placebo filter.

Conclusions:

The study results demonstrate a significant within-eye benefit of blue light filtration in visual performance among pseudophakes previously implanted with IOLs largely transparent to visible light.

Financial Interest:

One or more of the authors... is employed by a forNONEprofit company with an interest in the subject of the presentation