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ELEK LUDVIGH, Ph.D.

Arch Ophthal. 1938;20(5):713-725.

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

For the past half century the relation between visual purple and vision has been realized to be of fundamental importance. Many investigators¹ have compared the absorption spectrum of visual purple with the scotopic visibility curve. Some of the more recent comparisons have been made by Hecht and Williams,² Dartnall and Goodeve³ and Blum.⁴ The comparisons made by Hecht and Williams and by Blum are inadequate because the absorption spectrum of visual purple was compared with the scotopic ocular visibility curve, which means that no corrections were made for the selective absorption of light by the refractive media of the human eye. These comparisons are also inadequate because the absorption spectrum of visual purple used was that determined by Koettgen and Abelsdorff,^1c whereas the more recent work of Lythgoe,⁵ of Krause and Sidwell⁶ and of Bayliss, Lythgoe and Tansley⁷ has shown that . . . [Full Text PDF of this Article]

Author Affiliations
BOSTON

From the Howe Laboratory of Ophthalmology, Harvard University, and the Massachusetts Eye and Ear Infirmary.