Effects of viewing conditions on standard measures of acquired and congenital color defects.
We examined the effect of variations in viewing distance and viewing duration on the performance of color-normal observers with four standard tests of color vision. Significant effects of the experimental manipulations were obtained: both increasing viewing distance and decreasing viewing duration significantly increased the number of errors made by observers. Moreover, the four tests differed widely in their sensitivity to the variations in viewing conditions. Practical implications of the findings for the administration and selection of plate tests are discussed, and possible mechanisms underlying the results are suggested.
Somerfield
M R
MR
Department of Psychology, Villanova University, Pennsylvania.
Long
G M
GM
Tuck
J P
JP
Gillard
E T
ET
D003118:Color Perception / Q000502:physiology*; D003119:Color Perception Tests; D003117:Color Vision Defects / Q000151:congenital*; D004215:Distance Perception; D006801:Humans; D013997:Time Factors; D015351:Vision Screening / Q000379:methods*