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

Arch Ophthal. 1940;24(3):447-461.

	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 tests which are commonly employed for estimating visual function are carried out with the light-adapted patient. The acuity of the fovea is determined under optimal conditions of illumination, which means that the test chart is illuminated by at least 20 or more foot candles. Similarly, the isopters of the peripheral field are determined with white or colored test objects which reflect sufficient light to stimulate the peripheral portions of the light-adapted retina. Throughout the field areas of depressed function are detected in the photopic retina. The result of these tests allow us to evaluate the functional capacity of the photopic retina.

The retina behaves differently in the dark-adapted state, however, and there are well known diseased conditions in which it is normal when light adapted but is grossly abnormal in semidarkness. Numerous tests have been devised to measure its function in the dark-adapted state, and the literature is now . . . [Full Text PDF of this Article]

Author Affiliations
PHILADELPHIA

Footnotes
Research Fellow in Ophthalmology, University of Pennsylvania.

Part of a study conducted under a grant from the John and Mary R. Markle Foundation.

Read before the College of Physicians of Philadelphia, Section on Ophthalmology, Dec. 21, 1939.

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