The effect of horizontal differential prism on the binocular contrast sensitivity function.
The photopic binocular contrast sensitivity function is measured using a two-way resolution choice sinusoidal-grating target with horizontal differential prism before the right eye of one subject (AHT). A significant drop in sensitivity occurred with 3 prism-dioptres base-out or 4 prism-dioptres base-in prism at an observation distance of 5.9 m, and with 2 prism-dioptres base-out or 8 prism-dioptres base-in at 50 cm. An equivalent effect was confirmed with three additional subjects at a test distance of 2 m. The relationship between these results, the passive position, and the fusional reserves is discussed and reference is made to the effect of vertical differential prism.
D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D055095:Optics and Photonics