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Effects of task lighting on visual function in age-related macular degeneration

journal contribution
posted on 2006-03-01, 00:00 authored by S Haymes, J Lee
The purpose was to investigate the effects of the spectral power distribution (SPD) and illuminance of task lighting on visual function in age-related macular degeneration (ARMD) compared to normal healthy eyes. Twenty-eight subjects with ARMD and 18 age-matched normal subjects were studied. The effects on visual function were determined for four common task light sources: standard pearl coat incandescent (SP), daylight blue incandescent (DL), warm white fluorescent (WW) and cool white fluorescent (CW). Apart from a small, statistically significant improvement in contrast sensitivity with DL compared to SP lighting (0.5 dB, p = 0.01), there were no significant effects of SPD on other visual functions and no differences in the effects for subjects with ARMD and those with normal vision. Thus, for task lighting typically used in low vision rehabilitation, the SPD would seem to be of minimal clinical importance to visual function. However, increasing the task illuminance had a greater effect on visual function, in particular for subjects with ARMD (p < 0.01). For an increase in illuminance from 300 to 3000 lux, the mean increase in contrast sensitivity and near visual acuity was 1.5 dB and 0.13 log MAR, respectively. Although this effect is not large, we suggest that it is clinically relevant and supports the provision of additional task illuminance as an important part of low vision rehabilitation for patients with ARMD.

History

Journal

Ophthalmic and physiological optics

Volume

26

Issue

2

Pagination

169 - 179

Publisher

Wiley - Blackwell Publishing

Location

Oxford, England

ISSN

0275-5408

eISSN

1475-1313

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2006, The College of Optometrists

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