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Impressum
Correlations of Optic Disc Parameters in a South Indian Population Group
1Häsemeyer S., 2George R., 2Thomas R., 3Muliyel J. P., 1Jonas J. B.
1Department of Ophthalmology, Faculty for Clinical Medicine Mannheim of the University Heidelberg; 2Department of Ophthalmology, Christian Medical College, Vellore, Tamil Nadu, Indien; 3Department of Community Health, Christian Medical College, Vellore, Tamil Nadu, Indien
Purpose: The morphology of the optic nerve head is of utmost importance
for the diagnosis of optic nerve anomalies and diseases including the
glaucomas. Preceding studies have shown that for Caucasians, that the
optic disc parameters are correlated with each other. Since the morphology
of the optic disc depends on the ethnic background, the purpose of the
present study was to evaluate the interdependencies of optic disc parameters
in an epidemiologically selected population group in South India.
Patients and Methods: The study included 73 ophthalmologically
unremarkable subjects living in a suburb of Vellore, Tamil Nadu, South
India. The subjects were randomly chosen and asked to participate in a
routine eye examination and in the study. All subjects were adults (age
range, 35-65 years) and were part of a population based sample that had
been investigated 5 years prior to the start of the present study. The
subjects of the present study formed a randomly selected subgroup of subjects
who were called for a follow-up examination. The study group was compared
with a control group consisting of 50 Caucasian subjects. Color stereo
optic disc photographs taken of all subjects included in the study were
evaluated.
Results: Area and diameters of the optic disc were highly significantly
(P<0.001) correlated with area, diameters, and depth of the optic cup,
and the area of the neuroretinal rim. Size of the optic disc and neuroretinal
rim were statistically independent of age, refractive error (with exception
of the highly myopic eyes), right or left eye, and gender.
Conclusions: The optic nerve head parameters size of the optic
disc, neuroretinal rim, and optic cup show in normal eyes of South Indians
similar interdependencies as in normal eyes of Caucasians. It may be of
importance for the diagnosis of glaucoma in South Indian patients.