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Document Type

Research

Abstract

Evidence from various studies such as those of Cobb ( 1914), Ferree and Rand (1923), Fry and Bartley (1933), Hecht (193S), Graham and Cook (1937), Bartley (1941) and more recently by Lauer and Silver (194S) and others have indicated that brightness contrast, as a function of stimulus illumination and consequent retinal stimulation, is one of the basic factors in visual acuity. It is a safe assertion that seeing efficiency and acuity are closely related, up to a certain level of illumination. At higher levels of illumination this perhaps does not hold. In certain quarters an opinion persists that filters which narrow down the wave band of light will greatly increase acuity by clearer definition of the stimulus object and by penetrating certain conditions of fog and haze in the atmosphere or transmission medium. This belief is based on certain theoretical grounds which may be predicated on false assumptions.

Publication Date

1949

Journal Title

Proceedings of the Iowa Academy of Science

Volume

56

Issue

1

First Page

263

Last Page

270

Copyright

© Copyright 1949 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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