Korean J Ophthalmol > Volume 6(1); 1992 > Article
Korean Journal of Ophthalmology 1992;6(1):32-35.
DOI: https://doi.org/10.3341/kjo.1992.6.1.32    Published online June 30, 1992.
Optic disc of the myopic eye: relationship between refractive errors and morphometric characteristics.
Sung Min Hyung, Dong Myung Kim, Chul Hong, Dong Ho Youn
1Department of Ophthalmology, College of Medicine, Chungbuk National University Cheongju, Chungbuk, Korea.
2Department of Ophthalmology, College of Medicine, Seoul National University, Seoul, Korea.
3Glaucoma Service, Dr Hong's Eye Clinic, Seoul, Korea.
Abstract
Because the optic disc in myopic eyes is different from a normal optic disc, there are many difficulties in examining the optic discs of myopic eyes. To study optic disc change due to myopia, we performed a morphometrical study of stereophotographs of 61 men, 109 eyes, who had no glaucoma history. The range of refractive error was from +0.75 diopter to -12.75 diopter, and all subjects had intraocular pressure below or equal to 21 mmHg. According to the increase in the myopic degree, the temporal slope of the disc cup was significantly decreased, but the ratio of the vertical disc diameter (VDD) to the horizontal disc diameter and the ratio of the width of peripapillary atrophy (PPA) to the VDD were significantly increased. The above results suggests that in high myopia the optic disc was tilted and the rim-cup border was indistinct and there are some problems in the estimation of the morphometric parameters. Also in evaluation of the PPA of myopic glaucoma patients, there may be some difficulty in deciding whether it is due to myopic change or glaucomatous damage.
Key Words: horizontal disc diameter;myopia;optic disc;peripapillary atrophy;tem-poral slope;vertical disc diameter
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