Accession Number:

AD0285552

Title:

VISUAL ACUITY IN RELATION TO BODY ORIENTATION AND G-VECTOR

Descriptive Note:

Corporate Author:

AEROSPACE MEDICAL RESEARCH LABS WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1962-07-01

Pagination or Media Count:

1.0

Abstract:

The Armed Forces Vision Tester, fitted with checkerboard targets, was used in tests of visual acuity under viewing conditions involving various combinations of gravity effects. Twenty-four subjects were tested for left, right, and binocular acuity of near and far vision in each of four body positions standing upright, prone, supine, and inverted upright. The latter condition effectively produced -1 G acceleration. Intercomparisons of scores from these positions form the basis for useful generalizations concerning the effects on visual acuity of various acceleration environments, including 0 G. By comparison with their acuity at 1 G, subjects experience a decrement at -1 G of approximately 15. This is comparable to the decrement found by other investigators at 3 Gs. Since both -1 G and 3 Gs are 2 G-units removed from 1 G, it appears that equal changes in either direction from the normal acceleration environment produce equal losses in visual acuity as a function of the amount of change. This conclusion is supported by results of a previous study of acuity at 0 G, in which a small but statistically significant decrement comparable to that at 2 Gs was found. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE