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Characteristics of the optic disc cup
American Journal of Optometry and Physiological Optics
|March 1, 1985
Summary
This study analyzed optic cup/optic disc ratio (CDR) and optic cup depth (OCD) in clinical data. Most eyes had a CDR of 0.3 or less and OCD of 2 D or less, with differing distribution patterns.
Area of Science:
- Ophthalmology
- Optometry
- Clinical Research
Background:
- The optic cup/optic disc ratio (CDR) and optic cup depth (OCD) are key metrics in ophthalmic examinations.
- Understanding their frequency distribution is crucial for diagnosing and monitoring various eye conditions, particularly glaucoma.
Purpose of the Study:
- To investigate the frequency distribution of the optic cup/optic disc ratio (CDR) and optic cup depth (OCD) in a clinical population.
- To establish normative data for these ocular parameters.
Main Methods:
- Retrospective analysis of clinical data from a cohort of eyes.
- Calculation and statistical analysis of the mean, standard deviation, and frequency distribution for CDR and OCD.
Main Results:
- The mean CDR was 0.30 (SD = 0.13) and the mean OCD was 2.10 D (SD = 0.89 D).
- 74% of 1352 eyes had a CDR ≤ 0.3, and 68% of 1168 eyes had an OCD ≤ 2 D.
- The distribution of CDR differed from a normal distribution, while OCD distribution was nearly normal.
Conclusions:
- The study provides valuable insights into the typical ranges and distributions of CDR and OCD in a clinical setting.
- Findings can aid in the interpretation of these measurements for eye health assessments and disease detection.