There are different kinds of coloboma, depending on which part of the eye is missing. These include:
- Eyelid Colobma, in which a piece of the upper or lower eyelid is absent.
- Lens Coloboma, in which a piece of the lens is absent. The lens will typically appear with a notch.
- Macular Coloboma, in which the center of the retina, called the macula, doesn’t develop normally.
- Optic Nerve Coloboma, which refers to one of two things:
- Optic nerve coloboma in which an abnormal optic nerve is deeply “excavated” or hollowed out.
- Optic nerve coloboma that is large enough to involve the optic nerve.