Accession Number:

AD0271801

Title:

Studies on Dark Adaptation. VIII. The Effects of Pre-Exposure on Several Low-Brightness Tasks.

Descriptive Note:

Corporate Author:

TUFTS UNIV MEDFORD MASS INST FOR PSYCHOLOGICAL RESEARCH

Personal Author(s):

• HANSON,JOHN A.
• ANDERSON,EDYTHE M.S.

Report Date:

1961-12-01

Pagination or Media Count:

1.0

Abstract:

The pre-exposure tolerance of the dark-adapted human eye was investigated. The effects were studied of each of the major parameters of preexposure brightness, duration, color, etc. on the absolute threshold of the dark-adapted fovea. The results indicate that the observers ability to resume a low luminance task upon cessation of high illumination would not be appreciably affected, especially when the task is at a luminance significantly above that of the absolute threshold. Author

Descriptors:

• *ADAPTATION(PHYSIOLOGY)
• *VISION
• BRIGHTNESS
• SENSITIVITY
• THRESHOLDS(PHYSIOLOGY)
• VISUAL ACUITY

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE