A flexible biconvex lens for intra-capsular implantation in an intra-ocular lens capsule of a patient enables the lens refractive properties to be to altered by the transfer of forces from ciliary muscles of the patient to said the flexible biconvex lens. The flexible lens comprises a plurality of holes spaced at equal radial intervals around the periphery of the lens. The plurality of holes promote tissue ingrowths to secure the flexible biconvex lens to the intra-ocular lens capsule without requiring peripheral mechanical extensions, adhesives or mechanical fasteners to said flexible biconvex lens.