Optic disc coloboma
The optic disc is vertically oval with excavation. The retinal vessels have abnormal origin. The choroid and the iris may be involved. The condition may be bilateral.

Other examination:

  • if asked to check the visual field, the patient may have enlarged 

  • blind spot, arcuate scotoma or altitudinal defect depending on 
    the size of the coloboma.


1. What is the cause of optic nerve coloboma?

2. What is CHARGE syndrome?

Return to the main page