What is Coloboma?

Coloboma is the absence or defect of ocular (eye) tissue, usually a gap or cleft in one of the structures of the eye. Different parts of the eye can be affected, but the iris (colored part of eye) is the most commonly involved and is visible as a hole, split, or cleft in the iris. This usually occurs at the bottom of the eye. Coloboma can occur in various degrees of severity ranging from a small pit in the optic disk to extensive defects in various parts of the eye. Complete coloboma occurs when all structures of the eye are involved. Depending on the severity and part of the eye involved, vision may or may not be affected. Blurred vision or decreased visual acuity is common.

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