METHOD FOR MEASUREMENT OF VISUAL LUMINANCE

摘要

PURPOSE:To measure the visual sensitivity when a visual object is observed thoroughly closely by measuring equivalent retina luminance and visual object luminance, and processing the results thereof. CONSTITUTION:The visual object luminance signal from a photodetector 7 is amplified with an amplifier 8. The equivalent retina luminance signal from a photodetector 11 is amplified with an amplifier 12. The output of the amplifier 8 is fed to a luminance difference threshold calculating part 9 and a visual luminance calculating part 15 relating to fovea adaptation luminance. The output of the amplifier 12 is fed to a luminance difference threshold calculating part 13 relating to equivalent retina luminance. The outputs of the parts 9, 13 are fed to a luminance difference threshold calculating part 14. The visual luminance is determined by a visual luminance calculating part 15.