July 1973
Volume 12, Issue 7
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Articles  |   July 1973
Directional Sensitivity of the Foveal and Parafoveal Retina
Author Affiliations
  • JAY M. ENOCH
    Washington University School of Medicine, Department of Ophthalmology, and The Oscar Johnson Institute, 660 S. Euclid Ave., St. Louis, Mo. 63110
  • G. M. HOPE
    Washington University School of Medicine, Department of Ophthalmology, and The Oscar Johnson Institute, 660 S. Euclid Ave., St. Louis, Mo. 63110; Department of Ophthalmology, University of Louisville School of Medicine, 301 E. Walnut St., Louisville, Ky. 40202
Investigative Ophthalmology & Visual Science July 1973, Vol.12, 497-503. doi:
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      JAY M. ENOCH, G. M. HOPE; Directional Sensitivity of the Foveal and Parafoveal Retina. Invest. Ophthalmol. Vis. Sci. 1973;12(7):497-503.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Photopic directional sensitivity was measured at the fovea and at 2°, 3.75°, and 10° from fixation (referred to the center of the entrance pupil of the eye; nonfoveal tests were conducted in the nasal field projected onto temporal retina). These data confirm and extend an earlier experiment performed by Westheimer1. The central fovea exhibited significantly less directionality than parafoveal test points. Differences in directionality between the three parafoveal test loci were not significant. Possible factors giving rise to the foveal-parafoveal difference in directionality are reviewed. Evidence corroborating our earlier observations that receptors across the retina are aligned with the point approximating the center of the exit pupil of the eye is also presented.

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