Patent ID: 8641188

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 circumferential edge surface spaced between the front circumferential edge and the rear circumferential edge; and a lens cavity extending from the circumferential edge surface and at least partially through the lens thickness, the cavity having a proximal cavity portion proximal to the circumferential edge having a first cavity dimension, wherein the proximal cavity portion interrupts the lens circumferential edge surface for a portion of the circumference; and the lens cavity having a distal cavity portion distal from the circumferential edge and having a second 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 the lens magnetic member having first portion with a first magnetic member dimension sized to closely fit within the first cavity portion and a second lens magnetic member portion sized to closely fit within the second cavity portion.