The effect of vertical differential prism on the binocular contrast sensitivity function.
The binocular contrast sensitivity function is measured using horizontal sinusoidal gratings with base-down prism before the right eye. In photopic conditions one prism-dioptre causes a significant drop in sensitivity at all spatial frequencies and in mesopic conditions as little as a half prism-dioptre has a similar effect. The implications for a physiological tolerance for unintended vertical differential prism in spectacles are discussed.
D000221:Adaptation, Ocular; D000328:Adult; D003867:Depth Perception / Q000502:physiology*; D006801:Humans; D008027:Light; D008297:Male; D008875:Middle Aged; D055095:Optics and Photonics; D012684:Sensory Thresholds / Q000502:physiology; D013053:Spectrophotometry; D014792:Visual Acuity