US-based E-Vision Smart Optics unveiled a prototype version of its electronic contact lens system to demonstrate the lenses’ ability to electronically change diopters in real time to prospective licensing partners. The lenses work by sandwiching two layers of liquid crystal between three thin layers of polymer. When a small voltage is applied, the liquid crystal molecules change optical properties in milliseconds, controlling focus in the lens on demand, said Joel Zychick, E-Vision’s president.

The current device can be switched to one, two or three diopters of optical power but many other combinations can be designed into it, including higher and more distinct optical powers.  The commercial product will have its base optical power molded into the polymer, while the liquid crystal changes the optical power as required. All power, electronics, optics and communication components will be inside of the contact lens.  The power source will provide energy for a full day’s use and be recharged wirelessly when removed from the user’s eye overnight.