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Optic disc of the myopic eye: relationship between refractive errors and morphometric characteristics
1Department of Ophthalmology, College of Medicine, Chungbuk National University Cheongju, Korea.
Korean Journal of Ophthalmology : KJO
|June 1, 1992
Summary
Myopic optic discs show significant changes, including tilting and indistinct borders, complicating glaucoma diagnosis. These morphometric alterations in the optic disc are linked to increasing myopia severity.
Area of Science:
- Ophthalmology
- Optometry
- Medical Imaging
Background:
- Optic disc examination in myopic eyes presents challenges due to anatomical differences compared to normal eyes.
- Understanding these differences is crucial for accurate diagnosis and monitoring of eye conditions.
Purpose of the Study:
- To investigate morphometric changes in the optic disc associated with varying degrees of myopia.
- To assess the impact of myopia on optic disc parameters and their implications for clinical evaluation.
Main Methods:
- A morphometrical study was conducted using stereophotographs of 109 eyes from 61 men with refractive errors ranging from +0.75 to -12.75 diopters.
- Subjects had intraocular pressure ≤ 21 mmHg and no history of glaucoma.
Main Results:
- Increasing myopia correlated with a significant decrease in the temporal slope of the disc cup.
- The ratio of vertical disc diameter (VDD) to horizontal disc diameter and the ratio of peripapillary atrophy (PPA) width to VDD significantly increased with myopia.
- High myopia was associated with optic disc tilt and indistinct rim-cup borders.
Conclusions:
- Morphometric parameters of the optic disc are altered in myopia, potentially complicating accurate measurement.
- Distinguishing between myopic changes and glaucomatous damage in the optic disc, particularly peripapillary atrophy, can be challenging in myopic patients.