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Year : 2005  |  Volume : 53  |  Issue : 4  |  Page : 289-294

Correlation of confocal laser scanning tomography with planimetric photographic measurements of the optic disc in a normal South Indian population: The Vellore eye study

1 Department of Ophthalmology, Christian Medical College, Vellore , Tamil Nadu, India
2 Community Health Department, Christian Medical College, Vellore , Tamil Nadu, India
3 Department of Ophthalmology, Faculty of Clinical Medicine Mannheim, University of Heidelberg, Mannheim, Germany

Correspondence Address:
Ravi Thomas
L.V.Prasad Eye Institute, Banjara Hills, Hyderabad - 500 034, Andhra Pradesh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0301-4738.18916

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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 8.9 years, mean refractive error measured was -0.17 1.10 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.

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