Coloboma of the iris
Definition
Coloboma of the iris is a hole or defect of the iris of the eye. Most coloboma are present since birth (congenital).
Overview & Considerations
Coloboma of the iris may look like a black, round hole located in or next to the colored part of the eye (iris). It can look like a black notch of different depths at the edge of the pupil. This gives the pupil an irregular shape. It can also appear as a split in the iris from the pupil to the edge of the iris.
A small coloboma (specially if it is not attached to the pupil), may allow a second image to focus on the back of the eye, causing: The defect may include the retina, choroid, or optic nerve. Colobomas are generally diagnosed at, or shortly after birth.
Common Causes
Coloboma can occur due to: - Eye surgery
- Inherited conditions
- Trauma to the eye
Most cases of coloboma have no known cause and are not related to other abnormalities. A small percentage of people with coloboma have other inherited developmental problems.
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