the variations with age have been measured for a number of visual abilities associated with movement perception. a sample of 70 drivers was used in the age range 20-75. significant deteriorations with age were found for threshold angular movement; this deterioration was particularly marked for brief exposures (0.3 secs) in a night-time situation. however, very little decline with age was found for either static visual acuity (glasses worn if required) or simple visual reaction times in response to the onset of a light. significant increases in decision times with age were also found for a disc test-stimulus increasing in size at a rapid rate (in a three-choice multiple rate situation). using log-linear plots, the results suggest that there are exponential declines in angular movement perception with age for older age groups. replotting data from a large-scale u.s. driver vision study, exponential deteriorations with age for older age groups have also been shown for (a) daytime accident rates, (b) static visual acuity, (c) dynamic visual acuity, (d) the ratio dynamic/static acuity. the age breakpoints at which these relationships develop appear to be quite well defined but vary with the function concerned between the ages 38 and 55. (a)

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