title: Binocular summation in vernier acuity.
abstract: Monocular and binocular abutting line vernier acuities were measured as a function of contrast. Over a range of contrasts from near the line-detection threshold to approximately 20 times threshold, binocular vernier thresholds are lower (better) than monocular thresholds by approximately 50-60%, similar to the binocular improvement found for the detection of both a thin line and a dipole. At higher contrasts the binocular advantage diminishes, apparently as a result of saturation.
authors.affiliation: College of Optometry, University of Houston, Texas 77204-6052.
authors.forename: T
authors.initials: T
authors.lastname: Banton
authors.forename: D M
authors.initials: DM
authors.lastname: Levi
mesh_terms: D015350:Contrast Sensitivity / Q000502:physiology*; D006801:Humans; D012684:Sensory Thresholds; D015348:Vision, Binocular / Q000502:physiology*; D015349:Vision, Monocular / Q000502:physiology; D014792:Visual Acuity