Fine matrix mapping of the macular region in normal subjects.
Using a Humphrey field analyzer and fine matrix mapping, we measured photopic and scotopic thresholds for a blue light stimulus at 100 locations on a 9 degrees by 9 degrees matrix of 1 degree spacing centered at the fovea in 14 normal subjects. Additionally, trial lenses were used to investigate the effect of refractive error. Under photopic conditions the mean sensitivity varied by less than 1 dB over this region. Under scotopic conditions the central values were reduced in sensitivity by 15 dB compared with those at 4 degrees eccentricity. Defocus showed less than 1.2 dB loss with 1.00D of refractive error under photopic condition. The results reflect the properties of rod and cone photoreceptors and the effects of the rod mosaic near the fovea. This technique is a sensitive test of macular visual function.
Wu
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Zhonghan Ophthalmic Center, Sun Yat-sen University of Medical Sciences, Guangzhou.
Bird
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Mcnaught
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Buckland
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Fitzke
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D000328:Adult; D000368:Aged; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008266:Macula Lutea / Q000502:physiology*; D008875:Middle Aged; D010775:Photic Stimulation; D017948:Retinal Rod Photoreceptor Cells / Q000502:physiology; D014785:Vision, Ocular; D058609:Visual Field Tests / Q000379:methods*; D014794:Visual Fields