Abstract
To analyze separately the sensory and nonsensory aspects of reductions in contrast sensitivity with age. 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. There were no changes in slope or upper asymptote with age, but contrast sensitivity decreased with age. 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.
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