EnChroma Receptor CX3 62-12-135 fitover glasses for color blindness (unisex)

Never used EnChroma colour blindness glasses in black/chestnut. Perfect condition - still exactly like they came from the store. The Receptor fitover style can be worn right over your regular prescription glasses. The chestnut Cx3 (Trivex) lens type works great outdoors and helps with red-green colour blindness. The numbers, 1 and 3, in the names Cx1 and Cx3 refer to the lens filtering category that is standard in the lens industry. It indicates the amount of light that is transmitted or filtered through the lens. Cx1 lenses are Category 1 filters (44-80% transmission) for indoor, lower light conditions and Cx3 lenses are Category 3 filters (9-18% transmission), typical for sunglasses and bright sun. Trivex is an optical grade resin or urethane-based pre-polymer that is more durable and impact-resistant than many other lens types. The material also provides a sharper, crisper view for the wearer. The black frame is TR-90, a lightweight, flexible, and durable thermoplastic material. TR-90 frames are comfortable and resilient to damage because they can bend under pressure and contour to the wearer's face. Size: Large fitover frame Color: Chestnut lens, black frame Type: Cx3 lens (outdoor use) Includes original case, box, pads and all paperwork. These retail for $279