Coloboma
A cleft or gap in some part of the eye, such as the iris, lens, or retina, that is caused by a defect in the development of the eyeball. How much coloboma affects a person's vision depends on the size and location of the cleft and on whether it occurs in one or both eyes. For example, someone with only a tiny defect in the iris may have normal vision. However, a person with large defects in the retina and optic nerve may have limited vision. Children whose vision is impaired by coloboma may benefit from using reading materials that have large black print and well-spaced letters and words. They may also find it helpful to read one line at a time with the aid of a cutout reading window.
Suggested resource: www.tsbvi.edu/Education/anomalies/coloboma.htm
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