DEMONSTRATION OF GLAUCOMATOUS OPTIC DISC CHANGES BY ELECTRONIC SUBTRACTION

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Abstract
A new method, electronic substraction, for objective, 2 dimensional detection, demonstration and recording of glaucomatous optic disc changes is described. Siemens subtraction unit M 707 A, based on a double videochain and originally developed for roentgenography, was used. This technique apparently is useful in demonstrating the progressive damage of neural tissue of the disc and associated alterations in the course of the vessels. Further development of the electronic subtraction method for glaucomatous optic disc evaluation is discussed.