The coloboma - A rare birth defect in which a gap exists in the tissues of the eye. The gap may be in the eyelid or in part of the eyeball, such as the iris, retina, or choroid.

A coloboma in the iris will be visible as a black notch, or as a gap stretching from the pupil to the edge of the iris. The condition results from incomplete development of the eyes while the baby is still an embryo; this problem may, in turn, be linked to certain chromosomal abnormalities.

Coloboma may range from minor to severe. In some cases, it may cause blurred vision or decreased visual acuity.


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