What is a fundus or optic nerve coloboma?
A small or large developmental defect may occur in the deeper structures of the eye or eyes. The defect can involve the retina (layer of nerves responsible for sight) and/or optic nerve (connects the eye to the brain). Coloboma of the central retina or optic nerve can reduce vision, sometimes severely. The eye is occasionally smaller than normal. Does a coloboma inside the eye affect vision? If the coloboma involves the optic nerve or large areas of the retina, vision may be reduced. Depending on the extent of involvement, this varies from mild to severe reduction in vision. What are the signs of coloboma? The most common signs are a defect in the iris (iris coloboma), a small eye, or poor vision. What is a colobomatous cyst? Incomplete embryonic fissure closure produces a cyst outside the eye, attached to a very small eye. What is an optic nerve pit? An optic nerve pit may be related to coloboma and is a small defect near the margin of the optic nerve. Vision may be reduced if fluid c
