You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Typical coloboma of iris occurs and explain in detail?
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