The invention relates to an implantable intraocular lens (61) which comprises an optic (32) formed of a synthetic light-refractive material made that is pre-formed into a predetermined optic shape and that is both shape-retaining and resilient； and a flexible positioning member (34) configured to substantially conform with the capsule of an eye. The flexible positioning member (34) is operable, when the lens is placed within a human eye capsule, for changing the shape of the optic (32) in response to ciliary body movement. The optic (32) is composed of a refractive material (40) that is enveloped within a preformed capsule (42) formed of a flexible synthetic resin material,
