Color eyeground images, which were composed of B, G and R ones, were separately analyzed, and the diagnosis of the excavatio papillae nervi optici was attempted. The contrast between inside of the optic nerve nipple part and outside of it on an B-images was clearer than G- and R-images. Histogram analysis of the i mages derived the method of binarizing inside of papilla part. Then a computer system using the method may be able to diagnose excavatio papillae nervi optici based on the eyeground images.
