Citation

Yager D, Beard BL. Optom. Vis. Sci. 1994; 71(12): 778-782.

Affiliation

State College of Optometry, State University of New York, New York.

Copyright

(Copyright © 1994, Lippincott Williams and Wilkins)

DOI

unavailable

PMID

7898885

Abstract

PURPOSE: To analyze separately the sensory and nonsensory aspects of reductions in contrast sensitivity with age. METHODS: Two-alternative forced choice psychometric functions were fitted with a three-parameter Weibull function, which independently estimated threshold, slope, and upper asymptote of the functions. RESULTS: There were no changes in slope or upper asymptote with age, but contrast sensitivity decreased with age. CONCLUSIONS: Most studies of decreased visual function in the elderly are difficult to interpret because possible nonsensory effects are ignored. This paper illustrates a method that can be used to demonstrate a true sensory decline with age.

Language: en