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The arrangement of the three cone classes in the living human eye

Nature volume 397, pages 520522 (11 February 1999) | Download Citation

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Abstract

Human colour vision depends on three classes of receptor, the short- (S), medium- (M), and long- (L) wavelength-sensitive cones. These cone classes are interleaved in a single mosaic so that, at each point in the retina, only a single class of cone samples the retinal image. As a consequence, observers with normal trichromatic colour vision are necessarily colour blind on a local spatial scale1. The limits this places on vision depend on the relative numbers and arrangement of cones. Although the topography of human S cones is known2,3, the human L- and M-cone submosaics have resisted analysis. Adaptive optics, a technique used to overcome blur in ground-based telescopes4, can also overcome blur in the eye, allowing the sharpest images ever taken of the living retina5. Here we combine adaptive optics and retinal densitometry6 to obtain what are, to our knowledge, the first images of the arrangement of S, M and L cones in the living human eye. The proportion of L to M cones is strikingly different in two male subjects, each of whom has normal colour vision. The mosaics of both subjects have large patches in which either M or L cones are missing. This arrangement reduces the eye's ability to recover colour variations of high spatial frequency in the environment but may improve the recovery of luminance variations of high spatial frequency.

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Acknowledgements

We thank D. Brainard, D. Dacey, J. Jacobs, J. Liang, D. Miller and O. Packer for their assistance. We acknowledge financial support from the Fight for Sight research division of Prevent Blindness America (to A.R.) and the National Eye Institute and Research to Prevent Blindness (to D.R.W.).

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Author notes

    • Austin Roorda

    Present address: University of Houston, College of Optometry, Houston, Texas 77204-6052, USA

Affiliations

  1. *Center for Visual Science, University of Rochester, Rochester, New York 14627, USA

    • Austin Roorda
    •  & David R. Williams

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https://doi.org/10.1038/17383

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