PT  - JOURNAL ARTICLE
AU  - E Mutlukan
AU  - B E Damato
TI  - The dark perimetric stimulus.
AID  - 10.1136/bjo.76.5.264
DP  - 1992 May 01
TA  - British Journal of Ophthalmology
PG  - 264--267
VI  - 76
IP  - 5
4099  - http://bjo.bmj.com/content/76/5/264.short
4100  - http://bjo.bmj.com/content/76/5/264.full
SO  - Br J Ophthalmol1992 May 01; 76
AB  - We determined the disappearance eccentricities of dark and bright stimuli of equal size in the inferonasal central visual field using the oculokinetic perimetry technique at different levels of surrounding illumination. The results suggest that a dark stimulus on a bright background has a smaller 'isoptre' than an equally bright stimulus on a dark background, and that variation of ambient illumination and consequent alteration of background luminance have less effect on the visibility of a dark stimulus than a bright one.