the corneal implant of the current invention takes the general form of a thin , transparent , flexible , porous , biocompatible film of suitable polymer material . the implant is sufficiently porous , the porosity being imparted by the film being irradiated to produce tracks and the material in those tracks being subsequently removed through an etching process , to allow the adequate flow of gaseous and tissue fluid components through the film . specific embodiments of the invention are achieved by the addition of features to the general form . the embodiment applicable to corneal reshaping features a surface relief pattern in the implant . the artificial iris embodiment features an imprinted partly to fully opaque or partially reflective annular iris pattern of selected inner and outer diameters .