Abstract
The re-adaptation times of observers subjected to white or yellow headlamp glare has been measured in a scales laboratory representation of highway conditions. Some eighty-three observers have taken part within an age range of 18-66 years. There is found to be a positive correlation between re-adaptation time and age in both illuminants. Furthermore, the speed of re-adaptation is greater, and the percentage of accuracy higher, in white than in yellow filtered tungsten light of equal luminance. (A)