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ROBB McDONALD, M.D.; FRANCIS HEED ADLER, M.D.

Arch Ophthal. 1939;22(6):980-988.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

The tremendous increase in the sensitivity of the retina when it is kept in the dark for a prolonged period is common knowledge, and the quantitative measurement of this phenomenon is not new. It is also well known that certain pathologic conditions may affect this process of dark adaptation and give rise to varying degrees of night blindness. However, it has been only within the past decade that the knowledge of this fundamental principle has aroused widespread interest. The impetus was given by the realization that in certain metabolic disorders the course of the dark adaptation and final threshold (minimum light visible after a prolonged period in the dark) was altered.

These various metabolic disorders were linked to vitamin A deficiency by numerous investigators working in separate fields. The recognition of vitamin A as one of the products of decomposition of visual purple when acted on by light and its . . . [Full Text PDF of this Article]

Author Affiliations
PHILADELPHIA

From the Department of Ophthalmology and the Johnson Foundation for Medical Physics, University of Pennsylvania.

Footnotes
Supported by a grant from the John and Mary Markle Foundation.

Read at the Seventy-Fifth Annual Meeting of the American Ophthalmological Society, Hot Springs, Va., June 7, 1939.

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