期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：1980
卷号：XXIII Part B5
页码：732-741
出版社：Copernicus Publications
摘要：Cupping of the optic disc associated with the atrophy of the opticnerve is one of the earliest recognizable signs of glaucoma. Measurementsof the optic cup changes would provide objective evaluation inearly diagnosis and therapy of glaucomatous eyes, by following the courseof the patient in relation to the loss of visual field and medical orsurgical control .A semi-analytical photogrammetric technique, the radial section method,has been devised to provide general references so that any differencesin optic discs can be compared objectively. The coefficient of variationof the cup parameters is about 4% for cup diameter, and abour 5% for cupdepth and volume .Due to the small size of the dilated pupil and refractive index of theeye , the accuracy of photogrammetric measurements of the optic disc islimited . However, optimal geometry of fundus stereophotography can beobtained by convergent stereophotography. On model experiments with15 degrees of convergent angle, the new method improves the accuracyeight times in cup depth and more than two times in cup diameter measurementsover that of non-convergent method .
