Very low contrast vision under mesopic and photopic illumination. Paper prepared for the 52nd Annual Meeting of the Highway Research Board HRB, Washington, D.C., January 1973.

The objective of this research was to obtain normative data for three different measures of visual acuity under simulated night driving luminance (mesopic) and ordinary lighting (photopic) conditions in order to compare the performance of different age groups and to compare results with those of a previous study.