1. A curved disk of opaque glass or plastic, containing an imitation iris and pupil in the center, inserted beneath the eyelids and supported by the orbitl contents after evisceration (removal of the contents of the eyeball) or enucleation (surgical removal of an eye); it may be ready-made (stock) or custom made.
2. A prosthesis for placement in the orbit of an individual whose eye has been removed.

Enucleation is only done under drastic circumstances such as to remove a malignant tumor in the eye or to relieve intolerable pain in a blind eye. Following enucleation, an artificial eye (ocular prosthesis) is implanted as a cosmetic substitute for the real eye.