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Disc-to-macula distance to disc-diameter ratio for optic disc size estimation
Kwok Hei Mok1, Vincent Wing-hong Lee
1Eye Center, Hong Kong Adventis Hospital, University of Hong Kong, Hong Kong. akhmok@hkah.org.hk
Journal of Glaucoma
|October 4, 2002
Summary
The disc-to-macula distance to disc-diameter (DM:DD) ratio effectively estimates optic disc size. This ratio is particularly useful for identifying physiological macrodiscs in clinical settings.
Area of Science:
- Ophthalmology
- Optometry
- Medical Imaging
Background:
- Optic disc size is a crucial parameter in ophthalmological assessments.
- Accurate estimation of optic disc size aids in diagnosing conditions like glaucoma and identifying anatomical variations.
Purpose of the Study:
- To evaluate the utility of the disc-to-macula distance to disc-diameter (DM:DD) ratio for estimating optic disc size.
- To determine if the DM:DD ratio can differentiate between normal optic discs and physiological macrodiscs.
Main Methods:
- A study involving 88 normal subjects, 18 with physiological macrodiscs, and 16 early glaucoma patients.
- Disc-to-macula distance (DM) and disc diameter (DD) were measured using planimetry.
- The DM:DD ratio was calculated for each participant.
Main Results:
- No significant difference in DM was found across the groups.
- The DM:DD ratio was significantly lower in subjects with physiological macrodiscs compared to normal subjects and glaucoma patients (p < 0.0001).
- No correlation was observed between DM:DD ratios and refractive error (p = 0.10).
Conclusions:
- The DM:DD ratio serves as a reliable relative unit for optic disc size.
- The DM:DD ratio demonstrates clinical utility in identifying physiological macrodiscs.