The invention provides surgical procedures for implanting a keratoprosthesis in an eye of a subject in need using a kit comprising keratoprosthesis comprising a central optical core, a peripheral skirt around said central optical core, comprising at least one biocompatible polymer; and a marking tool comprising a polymeric surface in the shape of said central optical core.

An intraocular lens includes a substantially circular lens element formed of a transparent material and one or more haptics extending outwardly from an outer edge of the lens element. The one or more haptics are formed of a polymer foam material having a negative Poisson's ratio (NPR) and are configured to couple the intraocular lens to an eye of a patient. The lens includes an inner region having a first index of refraction and an outer region disposed circumferentially surrounding the inner region, the outer region having a second index of refraction different from the first index of refraction.

The invention provides keratoprosthesis devices and kits and surgical methods of their use.