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

Haymes, Sharon A. and Lee, Jenny 2006, Effects of task lighting on visual function in age-related macular degeneration, Ophthalmic and physiological optics, vol. 26, no. 2, pp. 169-179, doi: 10.1111/j.1475-1313.2006.00367.x.

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Title Effects of task lighting on visual function in age-related macular degeneration
Author(s) Haymes, Sharon A.
Lee, Jenny
Journal name Ophthalmic and physiological optics
Volume number 26
Issue number 2
Start page 169
End page 179
Total pages 11
Publisher Wiley - Blackwell Publishing
Place of publication Oxford, England
Publication date 2006-03
ISSN 0275-5408
Keyword(s) contrast sensitivity
low vision
optimal print size
reading speed
spectral power distribution
spectral sensitivity
visual function
Summary 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.
Language eng
DOI 10.1111/j.1475-1313.2006.00367.x
Field of Research 119999 Medical and Health Sciences not elsewhere classified
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2006, The College of Optometrists
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047567

Document type: Journal Article
Collections: Faculty of Health
School of Medicine
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