Sørensen N
Acta Ophthalmol (Copenh). 1979 Aug;57(4):718-24. doi: 10.1111/j.1755-3768.1979.tb00521.x.
By employing purple colour filters with a large blue and a small red transmission, normal and atrophic optic disks were photographed on colour transparencies. Normal optic disks reflect red light, and atrophic optic disks reflect blue light. The degree of atrophy estimated by colour contrast is quantitated by microdensitometry in the blue (470 nm) and in the red (640 nm) region of the transparencies. The difference between the blue and red density is used as an expression of optic disc colour.
通过使用具有大的蓝光透射和小的红光透射的紫色滤光片，在彩色透明片上拍摄正常和萎缩性视盘。正常视盘反射红光，萎缩性视盘反射蓝光。通过颜色对比估计的萎缩程度通过对透明片的蓝色（470纳米）和红色（640纳米）区域进行显微密度测定来定量。蓝色和红色密度之间的差异用作视盘颜色的一种表示。
