A coloboma is a congenital (present from birth) condition in which a portion of the eye structure fails to develop properly, resulting in a gap or hole in one or more parts of the eye. This condition can affect various parts of the eye. Depending on the location and size of the coloboma, the severity and impact on vision can vary significantly.

This fact sheet is part of our Ophthalmology and Optometry Information Guide series, developed to help people understand eye conditions and their impact on navigating the built environment.