|Year : 1976 | Volume
| Issue : 2 | Page : 23-24
An accessory optic disc
VB Pratap, MK Mehra
Dept of Ophthalmology, K. G. 's Medical College, Lucknow, India
V B Pratap
Dept of Ophthalmology, K. G. 's Medical College, Lucknow
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Pratap V B, Mehra M K. An accessory optic disc. Indian J Ophthalmol 1976;24:23-4
Accessory disc or the duplication of the optic disc is a quite rare congenital anomaly of the disc. Hardly few cases are reported in ophthalmic literature. The least marked condition is the presence of two sets of retinal vessels emerging from the two separate depression on the disc, but the cases have been recorded wherein an accessory disc usually smaller than other, is fused with normal disc at its margin, or separate completely from it. The accessory disc usually lies inferiorly to the normal disc, but may occupy any position. A similar case has been recently reported by Gupta and Santhamani.
The aim of reporting this case is to add one more case in literature of this rare congenital anomaly.
| Case Report|| |
A 40-year old man B. P. attended the ophthalmic out-patient with complaint of eye strain during near work. Externally both eyes were absolutely normal with vision of 6/6 each eye. He was subjected to retinoscopy after dilating the pupils, which showed a very mild astigmatic error (+ 0.5 D cyl. 90' both eyes) correctable upto 6/5 each eye. But left eye fundus examination revealed a striking finding i.e. two optic discs one slightly smaller below the normal disc [Figure - 1]. The rim, cup and lamina cribirosa of the accessory inferior disc were quite normal. The inferior, temporal and nasal vessels were coming out normally from the upper normal disc and dipping in accessory disc. The two normal looking inferior temporal and nasal vessels were coming out from accessory disc and were running down normally ; the macula and fovea were single, with no other anomaly in the fundus [Figure - 1]. Right eye fundus was absolutely normal.
This case was subjected to other investigations:
- L. E. visual field examination showed 8 shaped blind spot in left eye [Figure - 2].
- On X-ray optic foramen of both sides were normal.
- Carotid angiography on left side was done, which revealed only one ophthalmic artery, beyond this the artery could not be traced.
- Fundus fluorography revealed no abnormality.
| Summary|| |
A case of accessory optic disc, which is a rare congenital anomaly has been reported.
| References|| |
|1.|System of Ophthalmology,
Sir Duke Elder, Vol. III (1964), p. 671. Henery Kimpton, London.
Gupta C. P. and Shanthamani, 1975, Indian Jour of Ophth., 23,
[Figure - 1], [Figure - 2]