Patent ID: 7850301

Claim:
A lens apparatus for removably mounting a primary lens to an eyeglass frame comprising a lens and at least one lens magnetic member, the lens comprising: a lens front surface having a front circumferential edge; a lens rear surface having a rear circumferential edge spaced a distance from said front circumferential edge; a lens thickness spaced between the front lens surface and the rear lens surface; a lens edge surface spaced between the front circumferential edge and the rear circumferential edge; and a cavity extending through the lens thickness, the cavity having a proximal cavity portion proximal to the circumferential edge and having a first cavity dimension; and the cavity having a distal cavity portion distal from the circumferential edge and having a second cavity dimension, wherein the second cavity dimension is larger than the first cavity dimension; wherein the at least one lens magnetic member comprises: a magnetic member front surface; a magnetic member rear surface; a magnetic member edge surface; wherein a first portion is sized to fit within the first cavity portion; and a second portion is sized to fit within the second cavity portion wherein the magnetic member front surface is substantially flush with the lens front surface, the magnetic member rear surface is substantially flush with the lens rear surface and the magnetic member edge surface is substantially flush with the lens edge surface.