The effect of fixation conditions on depth discrimination thresholds at scotopic and photopic illuminance levels.

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Abstract
"In this study the precision of depth discrimination has been measured in a two rod test apparatus involving real-depth cues. Effects due to different methods of fixating the rods have been assessed at each of a number of levels of equal illuminance 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 illuminance was increased over a range of some five log units…. These results have a significance for photochemical theories of vision and for the current controversy concerning the role of convergence cues in stereoscopic acuity." (PsycINFO Database Record (c) 2006 APA, all rights reserved)