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.

Questions:

1. What is the cause of optic nerve coloboma?

Answer
It is caused by failure of closure of the fetal fissure. It is most commonly seen inferonasally.

2. What is CHARGE syndrome?

Answer
This is an assortment of congenital abnormalities:
ocular Coloboma
Heart defect
choanal Atresia
mental Retardation
Genitourinary and Ear anomalies.

Return to the main page