Coloboma - "Key-hole pupil"

Posted on September 22, 2017

Coloboma - "Key-hole pupil"
By: Jeffrey Colburn, MD

Have you ever seen a key-hole shaped pupil? This is called an iris coloboma. A coloboma is a congenital abnormality of the eye that occurs because one or more parts of the eye do not close correctly during development. Interestingly, an iris coloboma often does not adversely affect vision. However, you can have colobomas of other eye structures that may have a major affect on vision, such as retinal or optic nerve colobomas. A child with an iris coloboma needs to have a complete eye exam to rule out other more serious eye abnormalities. Also, colobomas may be a sign of more serious systemic abnormalities or syndromes, especially if both eyes are affected.

For further detail, check out this article from the AAPOS website:

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