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Abstract #10031 Published in IGR 5-3
Study of agreement of optic nerve parameters
Liang Y; Liu X; Ling Y; Huang JChinese Journal of Ophthalmology 2003; 39: 471-475
OBJECTIVE: To evaluate the interobserver and intraobserver agreement of parameters of the optic nerve head by Heidelberg Retina Tomograph (HRT). METHODS: Optic nerve heads from 50 eyes (30 subjects were imaged with HRT. Three ophthalmologists majoring in glaucoma traced the disc margin with a contour line. One of these observers repeatedly traced the disc margin with a contour line in triplicate at three different times. Eleven topographical parameters of the optic nerve head (including disc area, cup area, cup/disc area ratio, rim area, cup volume, rim volume, mean cup depth, maximum cup depth, cup shape measurement, mean retinal nerve fiber layer thickness, sectional area of the retinal nerve fiber layer) were analyzed with HRT software (version 2.01). Intraclass coefficients (ICC) and agreement of result estimation (kappa value) were calculated. RESULTS: The ICC results among the three observers for 12 parameters of optic nerve head topography were 0.976 ˜ 0.999, which showed almost perfect agreement; and the kappa value was 0.649 ˜ 0.767, which showed substantial agreement. ICC of the same observer at different times was 0.983 ˜ 0.999, which showed almost perfect agreement; and the kappa value was 0.810 ˜ 0.951, which showed substantial agreement. CONCLUSIONS: Tracing the optic nerve head with a contour line on HRT image is substantial to almost perfect for both interobserver and intraobserver in experienced ophthalmologists. This procedure is suitable for the clinical diagnosis and follow-up observation of glaucoma. LA: Chinese
Dr. Y. Liang, Zheng Xiao-ping Zhongshan Ophthalmic Center, Zhongshan University, Guangzhou 510060, China. ykoct@gzums.edu.cn
Classification:
2.14 Optic disc (Part of: 2 Anatomical structures in glaucoma)
6.9.1 Laser scanning (Part of: 6 Clinical examination methods > 6.9 Computerized image analysis)