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THE PALLOR OF THE OPTIC DISC: A quantitative photographic assessment by purple filter
Author(s) -
SØRENSEN PER NELLEMANN
Publication year - 1979
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1979.tb00521.x
Subject(s) - pallor , blue light , optic disc , optics , red light , ophthalmology , medicine , physics , biology , surgery , glaucoma , botany
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.