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2012 | 59 | 1 | 91-96
Article title

Light distributions on the retina: relevance to macular pigment photoprotection

Content
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EN
Abstracts
EN
Light exposure has been implicated in age-related macular degeneration (AMD). This study was designed to measure cumulative light distribution on the retina to determine whether it peaked in the macula. An eye-tracker recorded the subject's field of view and pupil size, and superimposed the gaze position. Fifteen naïve subjects formed a test group; 5 formed a control group. In phase 1, all subjects viewed a sequence of photographic images. In phase 2, the naïve subjects observed a video; in phase 3, they performed computer tasks; in phase 4, the subjects walked around freely. In phase 1, control subjects were instructed to gaze at bright features in the field of view and, in a second test, at dark features. Test group subjects were allowed to gaze freely for all phases. Using the subject's gaze coordinates, we calculated the cumulative light distribution on the retina. As expected for control subjects, cumulative retinal light distributions peaked and dipped in the fovea when they gazed at bright or dark features respectively in the field of view. The light distribution maps obtained from the test group showed a consistent tendency to peak in the macula in phase 3, a variable tendency in phase 4, but little tendency in phases 1 and 2. We conclude that a tendency for light to peak in the macula is a characteristic of some individuals and of certain tasks. In these situations, risk of AMD could be increased but, at the same time, mitigated by the presence of macular carotenoids.
Publisher

Year
Volume
59
Issue
1
Pages
91-96
Physical description
Dates
published
2012
received
2011-10-13
accepted
2012-03-01
(unknown)
2012-03-17
Contributors
  • Department of Physics, Florida International University, Miami, FL, USA
  • Department of Physics, Florida International University, Miami, FL, USA
  • Department of Physics, Florida International University, Miami, FL, USA
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-abpv59p91kz
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