Abstract

Absolute light and color thresholds for broad-band stimuli were determined between 0° and 15° using test fields from 7′ to 104′ in diameter. Photochromatic intervals increase with retinal eccentricity. In the fovea, they are greatest for short wavelengths, followed by medium, and then by long wavelengths; in the periphery, the order for short and medium wavelengths is reversed. Toward the peripheral retina, interval size for short and medium wavelengths increases at a negative rate and for long wavelengths at a positive rate. Photochromatic intervals vary with stimulus size. The two variables change in the same direction for short wavelengths and in opposite directions for medium wavelengths. No correlation is found for long wavelengths.

© 1971 Optical Society of America

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