| Relationship Between the Optic Disk and Retinal Vessels. |
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Hae Ran Chang, Ouk Choi |
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Department of Ophthalmology, Yonsei University, College of Medicine, Seoul, Korea. |
| 시신경 유두와 망막혈관과의 관계 |
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최억(Ouk Choi),장혜란(Hae Ran Chang) |
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| Abstract |
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Since Helmholtz discovered the ophthalmoscope in 1851, normal fundus has been possible to be observed. The findings of the optic disk and retinal vessels in the fundus are of great importance in the evaluation of intraocular diseases and systemic diseases(especially intracranial problems). The shape of the optic disk and retinal vessels have been described by many investigators. Direct ophthalmoscopy was performed on 800 normal eyes(400 persons) to evaluate following aspects; (1) The shape of the optic disk. (2) The distribution of the central retinal artery. (3) The origin of the C.R.A. from the disk. (4) The number of disk in accordance with three different shape of physiological cups. (5) The relationship between (1) and (2) (6) The relationship between (2) and (3). (7) The relationship between (2) and (4). The following results were obtained. 1. The shape of the optic disk. 1) The 353 eyes(44.13%) were round, and the 318 eyes(39.75%), vertically oval. 2) In the 289 persons(72.25%) the shape of the optic disk were same in both eyes. 2. The classification of the optic disk based on branching of the C.R.A. 1) The 425 eyes(53.13%) had symmetric distribution, and the 285 eyes(35.63%) had nasa1temporal up distribution. And at least one of the main branches of the C.R.A. passed by nasal side of the optic disk in every eye. 2) In the 215 persons(53.75%), the distribution of the C.R.A. were same in both eyes. 3. The origin of the C.R.A. in the optic disk. 1) The 411 eyes(51.38%) had their origin in the nasal center, and the 326 eyes(40.75%) in the center, And none of the eyes had their origin in temporal side. 2) In the 284 persons(71.00%) the origin of the C.R.A. were same in both eyes. 4. The physiological cupping of the optic disk. 1) Most of the eyes(634 eyes; 79.25%) had the optic disk of type A(C/D ratio< or =0.3 and located in the center). 2) The 365 persons(91.25%) had same disk in their both eyes. And the difference of C/D ratio between both eyes was less than 0.2 in 99.75%. 5. The relationship between the shape of the optic disk and the distribution of the branches of the C.R.A. was not significant statistically. 6. The nasal-temporal down distribution(Class 6) of the C.RA. appeared more when the C.R.A, originated from the nasal down than when it originated form the nasal center. 7. The nasal distribution(Class 1) of the C.R.A. appeared more in the cases of the type A than in the cases of type B which had medium or large optic cup and locakd in the center or slightly displaced to the temporal side. |
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