A developmental defect in the iris of the eye. The pupil is typically keyhole-shaped instead of round. Partial loss of vision and/or other developmental defects may be present.

pleural - colobomata

There are 2 types of Coloboma, anterior and posterior.

Anterior coloboma is what I have, in which the iris is slightly misshapen, giving my pupil a ice cream cone/comet shape. Other forms include a keyhole shape. It's hard to notice if you have dark brown eyes. It doesn't usually impair vision, although it makes staring at the sun a lot worse.

A posterior coloboma is found in the back of the eye, where the retina and optic nerve are malformed or have suffered trauma, ie. Retinal detachment. Somtimes laser eye surgery can fix it, sometimes not. It's not visible without a slit-lamp retinoscope, meaning an Ophthalmologist can tell looking at the fundus of the eye. I also have this too, and it impairs vision, potentially leading to blindness if untreated.

Usually one of these will only occur in one eye. It's very rare to see it bilaterally. (on both sides)

Col`o*bo"ma (?), n. [NL. fr. Gr. &?;, the part taken away in mutilation, fr. &?; to mutilate.] (Anat. & Med.)

A defect or malformation; esp., a fissure of the iris supposed to be a persistent embryonic cleft.


© Webster 1913

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