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.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1971
- Accession Number
- AD0744010
Entities
People
- Nadim A. Haddad
Organizations
- American University