Title

Visual Acuity In Relation To Body Orientation And G-Vector

Date

1962

Index Abstract

Coming Soon

Photo Quality

Complete

Report Number

MRL TDR 62-74

Creator

Pigg, Leroy D.

Kama, William N.

Corporate Author

Aerospace Medical Research Labs Wright-Patterson AFB Ohio

Laboratory

Behavioral Sciences Laboratory

Extent

18

Identifier

AD0285552

Access Rights

OTS

Distribution Classification

1

Contract

Laboratory Research - No Contract

DoD Project

7184

DoD Task

718406

DTIC Record Exists

No

Distribution Change Authority Correspondence

None

Distribution Conflict

No

Cover Price

0.5

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 G's. Since both -1 G and 3 G's 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 G's was found.

Report Availability

Full text available

Date Issued

1962-07

Provenance

Lockheed Martin Missiles & Fire Control

Type

report

Format

1 online resource