Accession Number:

AD0744010

Title:

Determination of Norms of Selected Attributes of Vision for Native and Non-Native Middle-Eastern Population, and the Effect of Certain Environmental and Nutritional Factors on Photopic and Scotopic Vision.

Descriptive Note:

Final technical rept.,

Corporate Author:

AMERICAN UNIV BEIRUT (LEBANON)

Personal Author(s):

• Haddad,Nadim A.

Report Date:

1971-06-30

Pagination or Media Count:

48.0

Abstract:

Using a University of Michigan specially adapted Bausch and Lomb Modified Orth-rater, visual norms of a three dimensional threshold visibility surface for a sample of native and non-native Middle Eastern population are reported. The three dimensions of the visual acuity surface were contrast, background luminance and subtended visual angle for achromatic conventional targets. In addition to the above, investigation of a possible change in visibility surface when clinically normal subjects were transferred from sea-level to an altitude of 6200 feet, and possible change before and after occupational exposure to sunlight, did not reveal a meaningful significant shift in the threshold visibility surface. Author

Descriptors:

• *NUTRITION
• ENVIRONMENTS
• VISUAL ACUITY
• HIGH ALTITUDE
• LIGHT
• SUN
• THRESHOLDS(PHYSIOLOGY)
• POPULATION
• STANDARDS
• MEASUREMENT
• OPHTHALMOLOGY
• MIDDLE EAST

Subject Categories:

• Anatomy and Physiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE