The Crave Lens is a durable PC lens from Carl Zeiss Vision that offers outstanding optical performance.Product Description.The Crave Lens is a durable PC lens from Carl Zeiss Vision that offers outstanding optical performance.The open frame construction provides ventilation that helps to evacuate steam.The lens is ripel treated to help keep fog, dirt, and grime off your lenses and to make water pearl off.Technical Details.Item No.CR3110.