When an eye is severely damaged by trauma or disease, it may be necessary to remove it surgically. The most common procedures are evisceration (removal of the contents of the eye) or enucleation (removal of the eye itself). Eye spheres are permanent implants to occupy the cavity that results from surgery. Conformers are temporary devices, which maintain the shape of the eye and prevent closure or adhesion during the healing process. When healing is complete, conformers are replaced with a prosthesis.