Depth-discrimination thresholds as a function of binocular differences of retinal illuminance at scotopic and photopic levels.

The precision of depth discrimination has been measured in a two-rod test apparatus involving real-depth cues. The effects of 2 variables have been studied: the level of equal retinal illuminance presented to the 2 eyes. The results have significance for photochemical theories of vision and for classical theory of binocular space discrimination.