title: Fluctuations of light absorption of healthy papillae repeatedly photographed over a long period of time.
abstract: In order to distinguish normal, age-related changes of the papilla from changes due to glaucoma, we investigated 7 normal papillae that had been photographed several times over a period of 11 years. By means of digital-image processing techniques, the red- and green-filtered, digitized pictures were compared directly using a subtraction method. The results seem to indicate that normal papillae do not blanch over a long period of time. The difficulties of comparison are discussed.
mesh_terms: D000375:Aging; D003201:Computers; D006801:Humans; D008027:Light; D009898:Optic Disk / Q000502:physiology*; D010781:Photography; D012542:Scattering, Radiation; D013382:Subtraction Technique