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Impressum
Parapapillary Atrophy in Normal Eyes of a Randomly Selected South Indian Population Group
1Hempel C., 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 parapapillary atrophy is of diagnostic and pathogenic
importance for the glaucomas. As part of the morphology of the optic nerve
head, its physiologic variations may depend on the ethnic background.
The purpose of the present study was to evaluate the frequency and the
size of the parapapillary atrophy in normal eyes in a South Indian population.
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: Alpha zone of parapapillary atrophy was highly significantly
(P<0.001) more common and highly significantly (P<0.001) larger
than beta zone of parapapillary atrophy. Both zones were significantly
(P<0.01) most common and were significantly (P<0.01) the largest
in the temporal horizontal parapapillary sector, followed by the temporal
inferior sector, the temporal superior sector, and finally, the nasal
sector. Frequency and size of both zones were statistically independent
of the size of the neuroretinal rim and of right or left eye and of gender.
Frequency and size of both zones were statistically dependent of the size
of the optic disc.
Conclusions: Zones alpha and beta of the parapapillary atrophy
have in normal eyes of South Indians and of Caucasians a similar frequency
and distribution. It suggests that parapapillary atrophy may be of diagnostic
importance for the diagnosis of glaucoma in South Indians as it is in
Caucasians.