Binocular summation in vernier acuity.
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.
Banton
T
T
College of Optometry, University of Houston, Texas 77204-6052.
Levi
D M
DM
D015350:Contrast Sensitivity / Q000502:physiology*; D006801:Humans; D012684:Sensory Thresholds; D015348:Vision, Binocular / Q000502:physiology*; D015349:Vision, Monocular / Q000502:physiology; D014792:Visual Acuity