December 1968
Volume 7, Issue 6
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Articles  |   December 1968
An Absolute Threshold Defect in the Inferior Retina
Author Affiliations
  • ALEX E. KRILL
    Eye Research Laboratories, The University of Chicago, Chicago, Ill.
  • VIVIANNE C. SMITH
    Eye Research Laboratories, The University of Chicago, Chicago, Ill.
  • RICHARD BLOUGH
    Eye Research Laboratories, The University of Chicago, Chicago, Ill.
  • ARLENE PASS
    Eye Research Laboratories, The University of Chicago, Chicago, Ill.
Investigative Ophthalmology & Visual Science December 1968, Vol.7, 701-707. doi:
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    • Get Citation

      ALEX E. KRILL, VIVIANNE C. SMITH, RICHARD BLOUGH, ARLENE PASS; An Absolute Threshold Defect in the Inferior Retina. Invest. Ophthalmol. Vis. Sci. 1968;7(6):701-707.

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

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Abstract

Absolute thresholds were checked in six meridians in 18 patients at 10 and 20 degrees eccentricity, with ΒΌ degree and 1 degree targets. Thresholds averaged higher in the inferior than in the superior retina. The highest threshold was obtained from the inferior vertical meridian. Area-intensity functions were obtained from 3 subjects for the superior and inferior vertical meridians. The thresholds were generally higher for the inferior meridians. The results were discussed in terms of possible retinal factors. The difference in function between the inferior and superior retinal meridians is probably embryological in origin and presumably is secondary to delayed retinal differentiation in the region of the embryonic fissure.

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