Ratio of optic cup to optic disc. In relation to axial length of eyeball and refraction.
نویسندگان
چکیده
منابع مشابه
Distribution of optic disc parameters measured by OCT: findings from a population-based study of 6-year-old Australian children.
PURPOSE To study the distribution of optic disc, cup, and neural rim size by ocular and demographic variables in a population-based sample of 6-year-old children. METHODS The Sydney Childhood Eye Study examined 1765 of 2238 eligible 6-year-old children (78.9%) from 34 randomly selected Sydney schools during 2003 to 2004. Comprehensive standardized eye examination included cycloplegic autorefr...
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PURPOSE To investigate the effects of age, eye refraction, and disc area on topographic parameters of the optic nerve head in normal volunteers, using the Heidelberg Retina Tomograph. METHODS Seventy-seven eyes of 77 normal volunteers were examined by scanning laser tomography. The topographic parameters analyzed were disc area, cup area, cup/disc area ratio, rim area, cup volume, rim volume,...
متن کاملOvalness of the optic cup and disc in the normal eye.
Observations have been made of the horizontal extent of cupping of the optic nerve head in both normal and glaucomatous eyes in an attempt to determine the factors which influence cup size in the normal eye (Armaly, I967; Armaly and Sayegh, I969; Armaly, 1969a, b; Tomlinson and Phillips, I969; Jonsas, I972) and to establish differential diagnostic criteria for glaucomatous excavation (Armaly, I...
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Pathological excavation of the optic disc in the apparent absence of raised ocular tension was first described by von Graefe (1857), and since then it has aroused interest among ophthalmologists; various names have been given to it and these have reflected ideas about its aetiology. Schnabel (I885) described a cavernous optic atrophy which he believed had resulted from progressive diminution of...
متن کاملAutomatic Optic Disc Center and Boundary Detection in Color Fundus Images
Accurately detection of retinal landmarks, like optic disc, is an important step in the computer aided diagnosis frameworks. This paper presents an efficient method for automatic detection of the optic disc’s center and estimating its boundary. The center and initial diameter of optic disc are estimated by employing an ANN classifier. The ANN classifier employs visual features of vessels and th...
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عنوان ژورنال:
- The British journal of ophthalmology
دوره 53 11 شماره
صفحات -
تاریخ انتشار 1969