Field quadrant asymmetry in perimetric thresholds: results of normal and red-green-deficient persons.

Perimetric thresholds of normal and red-green-deficient persons were measured using three colored test stimuli and a low-intensity white background. Meridians of 45 degrees, 135 degrees, 225 degrees and 315 degrees were tested within 30 degrees peripherally. A statistically significant sensitivity difference between the quadrants was found at eccentricities of 5-30 degrees from the center with the highest sensitivity in the lower temporal field and the lowest one in the upper nasal field, this difference being slightly larger when tested with red (615 nm) or violet (443 nm) light compared with blue-green (497 nm) test light. No difference in the field quadrant sensitivity was observed between the results of the series of normal and red-green-deficient persons.

Perimetric testing of tritan deficiency.

Three members of a family with dominantly inherited juvenile optic atrophy tested with a computerized perimeter employing violet and blue-green test lights and low-intensity white background, all showed larger reduction in the relative sensitivity to violet light in the more central parts of the visual field compared with the periphery within 30 degrees from the center. Two subjects had typical optic atrophy, centrocecal scotoma and lower than normal visual acuity. In 1 subject with good visual acuity of both eyes, no optic atrophy was observed but there was impairment in the luminosity function (tested with white test object on white background) of the peripheral visual field.