August 1971
Volume 10, Issue 8
Articles  |   August 1971
Photopic Abnormalities in Congenital Stationary Nightblindness
Author Affiliations
    Eye Research Laboratories, the University of Chicago, Chicago, Ill.
    Eye Research Laboratories, the University of Chicago, Chicago, Ill.
Investigative Ophthalmology & Visual Science August 1971, Vol.10, 625-636. doi:
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      ALEX E. KRILL, DEIDRE MARTIN; Photopic Abnormalities in Congenital Stationary Nightblindness. Invest. Ophthalmol. Vis. Sci. 1971;10(8):625-636.

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

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Fourteen patients with congenital nightblindness, representing all three hereditary types, were studied, and all were found to have some type of photopic abnormality. The photopic abnormalities consisted of abnormal visual acuity, slower-than-normal final cone thresholds, elevated cone thresholds, subnormal photopic responses, slower-than-normal photopic a- and b-wave implicit times, and low flicker fusion frequencies. One or more of these abnormalities were noted in all patients. Only visual acuity could be related to the specific type of inheritance involved. No other photopic or scotopic abnormality bore a constant relation to the hereditary pattern. Congenital nightblindness, regardless of the hereditary type, is characterized by both scotopic and photopic abnormalities.


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