US Patent 7623295 Optical device characterization

A method and system for determining the orientation of an optical device, the optical device having data carrier means for carrying data related to the optical device, the data carrier having data carrier means operable in at least one of an electrical mode and a magnetic mode; the data carrier means being associated with an optical device by at least at least one of the group of depositing on or printing on a posterior surface or anterior surface of the optical device, including the data carrier with the optical device material, wherein data carrier means emits a data signal periodically or in response to a external signal from an external means.