Brightness perception under transient glare conditions with myopic observers wearing contact lens and spectacles

LUIS ISSOLIO; NORBERTO LÓPEZ GIL; ELISA COLOMBO; IGNACIO MIRÓ

Proceedings of SPIE

Society of Photo?Opt. Instrum. Eng (SPIE)

Año: 2001 vol. 4419 p. 557 - 560

0277-786X

Transient glare reduces the perceived brightness for stimulus luminances within the scotopic-mesopic range1,2. This work studies this effect in myopic observers with lens and spectacles corrections (-0,25D, -0,75D y -4,25D) and in one emmetrope. The task of the subject consists of compare brightness of two uniform luminance fields sequentially displayed, one of which had a reference luminance of 1 cd/m2. The reference stimulus was presented under glare condition (15lx, 30lx y 60lx), the angle between the glare source and the line of sight was 10°. The reference field and the glare source were onset at the same time (SOA=0). Subjects had to report which field was brighter with respect to one another. A YES-NO method with constant stimulus was adopted to determine the perceptual matching luminance. The duration of each stimulus was 300 msec and the interval between both of them was 1.2 msec. We found the effect of the transient glare is stronger as myopic subjects wear glasses corrections than they wear contact lens and the effect is even less for emmetropic subject with the naked eyes. Results could be explained considering an additional ectoptic light veil due to scattering on the glasses and lens.