Estimation of straylight in the eye and its relation to visual function

Abstract

Relative amount of straylight in the eye of individual observers was estimated using a psychophysical method proposed by Shinoda et al. Asymptotic illuminance of disturbing light presented in front of observer’s eye to blur different sizes of the gap in the Landolt C was measured with the haze filters of which haze factors were known. From the relation between the haze factor and the asymptotic illuminance of the disturbing light for the average observer, the relative haze factor of each observer’s eye was estimated. White and colored LEDs (λ p = 645, 530, and 480 nm) were used as the disturbing lights. The four different disturbing lights showed similar tendencies among nine young observers with healthy eyes. The ability to read colored characters was also examined for six observers in the same group. A negative correlation was found between the estimation of straylight in the eye and reading performance.