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Observational analysis investigates optic cup characteristics in a specific eye population, indicating variability in optic metrics.
The frequency distribution of the optic cup/optic disc ratio (CDR) and the optic cup depth (OCD) were investigated using clinical data. The mean CDR is 0.30 (SD = 0.13), and the mean OCD is 2.10 D (SD = 0.89 D). Seventy‐four percent of 1352 eyes had a CDR of 0.3 or less, and 68% of 1168 eyes had an OCD of 2 D or less. The distribution of the CDR's differs from a normal distribution, but that of the OCD's is nearly normal.
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I. K. O. K. Kragha (1985) studied this question.
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