|Year : 1975 | Volume
| Issue : 2 | Page : 26
Duplication of the optic disc
CP Gupta, Santhamani
Government Ophthalmic Hospital, Madras, India
C P Gupta
Government Ophthalmic Hospital, Madras
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Gupta C P, Santhamani. Duplication of the optic disc. Indian J Ophthalmol 1975;23:26
A case of duplication of the optic disc is reported because of its rarity. 
| Case Report|| |
A 17 year old girl attended the Govt. Ophthalmic Hospital, Madras, complaining of intermittant headache of 2 years duration. Headache was not related to ocular use. History was suggestive that these were migranous.
On examination, vision right eye was 6/9 with -2.25 sph. and left eye was 6/9 with -0.75 cyl. axis 80 Externally, both eyes appeared normal. The right fundus was normal. The left fundus showed a normal disc with slightly blurred margins. About half a disc diameter below there was another optic disc about half the normal size. The vessels emerging from the superior disc were tortuous and in their downward course seem to dip into the smaller disc. No separate vessels were seen emerging from the smaller disc. [Figure - 1]. The macula and the rest of the fundus was normal. Peripheral fields with 3/330 white object were full in both eyes. Central field with 3/1000 object was full in the right eye while the left eye showed 2 blind spots corresponding to the 2 optic discs.
The optic nerve is formed by the passage of the ganglion cells of the developing retina into the optic stalk (15 m.m. stage). During this process, some retinal cells are cut off from the main body and form the `Primitive Epithilial Papilla of Bergmiester'. Persum. ably, in the duplicated optic disc a much larger number of retinal cells are cut off and divide the opening of optic stalk into two. Further development of the eye may seperate the two optic discs.
| Summary|| |
A case of duplication of the optic disc is reported and the possible mechanism of its formation is discussed.
| Acknowledgements|| |
We are grateful to the Superintendent, Govt. Ophthalmic Hospi!al, Madras for permission to publish this case and to Dr. J. Agarwal for the fundus photographs.
| References|| |
Duke-Elder S. 1954. System Of Ophthalmology Vol III Part 2 671. Henry Kimpton London.
[Figure - 1]