1993 Volume 49 Issue 12 Pages 1984-1991
No reports exist to describe the factors of color and time in evaluating diagnostic images. We studied the visual characteristics concerning time factors. Namely, changes in visual acuity and visual fatigue were studied according to various kinds of light sources. Visual acuity was kept during the longest time when using yellow and green light sources. On the other hand, visual acuity decreased gradually when using a blue light source. Regarding visual fatigue, green was the best light source. From the ROC curves in the visual evaluation of images, yellow and green were the best light source, with blue being the worst. The most suitable wavelength was between 535 and 620 nm for every color concerning discriminations of density and luminance. The best wavelength discrimination was between 490 and 600 nm. These results were in good agreement with those of visual acuity, visual fatigue and the ROC curves.
