Typical coloboma of iris occurs

CONGENITAL COLOBOMA OF THE UVEAL TRACT Congenital coloboma (absence of tissue) of iris,ciliarybody and choroid may be seen in association or independently. Coloboma may be typical or atypical. Typical coloboma: is seen in the inferonasal quadrant and occurs due to defective closure of the embryonic fissure. Atypical coloboma: is occasionally found in other positions. Ref:- A K KHURANA; pg num:-137