COMMUNITY OPHTHALMOLOGY |
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Year : 2005 | Volume
: 53
| Issue : 4 | Page : 289-294 |
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Correlation of confocal laser scanning tomography with planimetric photographic measurements of the optic disc in a normal South Indian population: The Vellore eye study
Ravi Thomas1, Ronnie George1, Jayapraksh Muliyil2, Jost B Jonas3
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 India
Source of Support: None, Conflict of Interest: None | Check |
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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