Patent ID: 7623295
Filing Date: 2009-11-24
Classification: A45C,G02B,G02C,G07C

Abstract:
1. A method for determining the orientation of an optical device, said optical device having an anterior surface and a posterior surface, said method having the steps of: providing said optical device with uniquely identifiable data carrier means for carrying data related to said optical device, said data carrier means operable in at least one of an electrical mode and a magnetic mode; said data carrier being deposited on said posterior surface and/or said anterior surface; providing an activation signal from an external means; activating said data carrier means with said activation signal to cause said data carrier means to emit a data signal in response to said activating signal; processing said emitted data signal to determine said characteristics the emitted data signal; whereby said data signal emitted by said data carrier means on said anterior surface is distinguishable from said data signal emitted by said data carrier means on said posterior surface.