Nasal-temporal differences in cone-opponency in the near peripheral retina

A. Panorgias, N. R A Parry, D. J. McKeefry, J. J. Kulikowski, I. J. Murray

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    The purpose of this study is to establish whether nasal-temporal differences in cone photoreceptor distributions are linked to differences in colour matching performance in the two hemi-fields. Perceived shifts in chromaticity were measured using an asymmetric matching paradigm. They were expressed in terms of hue rotations and relative saturation changes and also in terms of activation levels of L-M or S-(L+M) cone-opponent channels. Up to 19° eccentricity there was little difference in chromaticity shifts between nasal and temporal retina for either channel. For matches beyond 19° L-M activation is significantly lower in the nasal field and the S-(L+M) channel was equally activated in both fields. The data are consistent with the asymmetric distribution of L- and M-cones in the nasal and temporal retinae. © 2009 The College of Optometrists.
    Original languageEnglish
    Pages (from-to)375-381
    Number of pages6
    JournalOphthalmic and Physiological Optics
    Issue number3
    Publication statusPublished - May 2009


    • Colour matching
    • Cone-opponent channels
    • Nasal-temporal retina
    • Peripheral retina


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