Luxury eyewear brands and optical retailers today are fighting an expanding counterfeit market that damages revenue, brand safety and consumer trust. NFC authentication can now be embedded seamlessly into designer sunglasses and prescription frames, giving every product a digital identity that can be verified with an NFC-enabled smartphone. This guide explains temple and hinge tag placement, in-store try-on authentication, prescription frame traceability and secondhand resale verification, helping brands strengthen eyewear brand protection from production through the optics retail supply chain.