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- W2514571978 abstract "Monday 4:00 - 7:30 PM: Cones, Genetics aTld Color Vision Paper Presentation, Opera House PLACEMENr OF LAND M co~ IN1'.BE PERIPHERAL PHOTORECEPrOR MATRIX C. M. Cicerone and S. Otake University of California, Irvine, CA Purpose~ We sought t:o survey the placement of individual Land M cones within the photoreceptor matrix. Metbode. We chose a region of retina centered at 17 deg temporal eccentricity, where the cone spacing (3' center-toM center) allow.a the possibility of stimulating single cones, despite the constraints imposed by fixational inaccuracy and light scatter due to the eye's optics. Stimuli were presented in Maxwellian view with an external fixation light whose position could be controlled with an accuracy of better than 0.03 of arc. Tests were presented after a rod bleach and upon a rod- and S-cone~euppressing background. We employed a two step method, initially using small spot color naming to identify Lor M cone rich areas and subsequently measuring spectral sensitivity to confirm cone identity. The observer judged the redness or greennesa of a test (0.86', 50 msec, self-presented) of wavelength 555 mn, equally effective for L and M cones, presented at successive locations in a grid of 1.5' spacing. Spectral sensitivity meaaurementa excluded the possibility that rode or Scones contributed to these determ;nations and confirmed the results of color naming. Besulq. We have obt.ained maps, based on the observers' judgements of color appe8l'ance as a function of location, defining L cone rich, M cone rich and mixed cone regions, which were confirmed by measurements of spectral sensitivity. There is little day-to~day variability in these maps. Conclysiona. We conclude that our maps do not define a regular attay; instead a random or quasi random placement of L and M cones within the receptor mosaic of the human peripheral retina is observed. Supported by NSF-BNS8819874 and NIH-EYOB200 to CMC. None" @default.
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- W2514571978 date "1993-03-15" @default.
- W2514571978 modified "2023-09-28" @default.
- W2514571978 title "PLACEMENT OF L-CONE AND M-CONE IN THE PERIPHERAL PHOTORECEPTOR MATRIX" @default.
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