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  Coloboma
Posted by: Toni - on 12/4/2009 4:55:00 PM
e-mail: iris@flow.com.au ,

Message:
This is a coloboma. This is a reasonalby rare genetic disorder. (about 1 in 10,000 births) A coloboma is a gap in part of the structures of the eye, which can be large or small. It is most commonly found in the lower section of the eye (at 6 o’clock). A coloboma is caused when a baby's eyes do not develop properly between the fourth and fifteenth week of pregnancy.
Coloboma can affect one eye (unilateral) or both eyes (bilateral). A coloboma does not mean that there is a hole in the eye, but that certain structures or parts within the eye (particularly the iris) did not fully form.

A coloboma can affect the iris (the coloured part at the front of the eye). It can affect the lens and the choroid (a thin network of blood vessels which help to keep the retina healthy). Finally, it can affect the retina at the back of the eye. Very rarely coloboma can also affect the optic disc or the eyelid.

A coloboma can affect vision depending which part of the eye is affected and how big the gap is. Most commonly coloboma only affects the iris. Children with this type of coloboma often have fairly good vision. Their pupil may be shaped a bit like a keyhole. They may have some problems with and dislike bright lights because the iris, which usually limits the amount of light entering the eye by controlling the size of the pupil, may not work properly.




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