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Abstract #3700 Published in IGR 4-2
A morphological study of neuroretinal rim for different types of optic disc in normal eyes and early glaucoma
Xu L; Xia C; Yang HChinese Journal of Ophthalmology 2002; 38: 325-328
OBJECTIVE: To investigate the morphological characteristics of the neuroretinal rim in different types of normal optic discs and early glaucoma. METHODS: The subjects were divided into four groups: 41 eyes with physiologically small discs; 40 eyes with physiologically large discs; 42 eyes with normal sized discs; and 45 eyes with early glaucoma. The optic disc area, neuroretinal rim area, cup area and a circuit (each 10°) neuroretinal rim widths were measured using a computerized imaging system. The curve of sequential neuroretinal rim widths was made from temporal to superior, nasal, and inferior. RESULTS: (1) The morphological characteristic of the curve of sequential rim widths in normal eyes was that there were double humps in the inferior and superior sections, and a double valley in the nasal and temporal sections. (2) The loss of double humps in the inferior and superior sections was at the curve of sequential rim widths in early glaucoma. It was lower than the nasal and higher than the temporal section. (3) The inferior rim width of physiologically large discs was the widest, while the superior rim width was the widest in physiologically small discs, followed by the nasal and temporal sections. (4) The correct discrimination ratio was 85.7% and 90.6% with rim area plus C/D and sequential neuroretinal rim widths (inferior 6:20 and superior 1:00 neuroretinal rim widths were the most effective), respectively, in multivariate discrimination. CONCLUSIONS: The nasal neuroretinal rim width itself is regarded as the standard, and the superior and inferior should be compared with the nasal neuroretinal rim width in estimating the morphological characteristics of the neuroretinal rim. This is very effective in discriminating physiologically large optic cups from early glaucomatous cups. LA: Chinese
Dr. L. Xu, Tongren Ophthalmic Center, Capital University of Medical Science, Beijing 100005 China. xuliang@public.bta.net.cn
Classification:
2.14 Optic disc (Part of: 2 Anatomical structures in glaucoma)
6.8.2 Posterior segment (Part of: 6 Clinical examination methods > 6.8 Photography)
