The Effect of Fixation Conditions on Depth-Discrimination Thresholds at Scotopic and Photonic I luminance Levels

摘要

The precision of death discriminations has been measured in a two-rod test apparatus involving real-depth cues. Effects due to different methods of fixating the and have been assessed at each of a number of levels of equal illuminate presented to the two eyes. It was found that for all three methods of fixation, the precision of depth discrimination increased by about 20. 1 as the level of illuminate was increased over a range of some five hog mains.