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Abstract #13258 Published in IGR 8-1
Correlation of confocal laser scanning tomography with planimetric photographic measurements of the optic disc in a normal South Indian population: The vellore eye study
Thomas R; George R; Muliyil J; Jonas JBIndian Journal of Ophthalmology 2005; 53: 289-294
PURPOSE: To compare the confocal laser tomographic scanning evaluation with photographic measurements of the optic nerve head in a South Indian population. METHODS: The prospective comparative clinical non-interventional epidemiologic study included 62 subjects (62 eyes) forming a population-based sample, selected randomly. Mean age was 47.2 9 years, mean refractive error measured was -0.17 10 diopter (range, - 4.50 to + 2.50 diopter). Confocal laser scanning tomographic images on Heidelberg Retina Tomograph (HRT) and colour optic disc photographs were morphometrically analysed and compared. Main outcome measures were morphologic optic disc parameters. RESULTS: The optic disc area measurements were significantly smaller (p < 0.001) in the HRT technique than in the photographic method. In contrast, the HRT as compared to the photographic measurements showed significantly (p < 0.001) larger values for the relative width and relative area of the neuroretinal rim. The differences in measurements between both methods were maximum in the nasal part (p < 0.001) of the optic disc and minimum in the temporal disc region. CONCLUSION: In normal eyes of South Indians, neuroretinal rim measurements by the HRT and expressed as percentage of disc size measurements are significantly larger than rim measurements on disc photographs.
Dr. R. Thomas, L.V.Prasad Eye Institute, Banjara Hills, Hyderabad - 500 034, Andhra Pradesh, India
Classification:
6.8.2 Posterior segment (Part of: 6 Clinical examination methods > 6.8 Photography)
6.9.1 Laser scanning (Part of: 6 Clinical examination methods > 6.9 Computerized image analysis)
