American Optical Calobar Sunglasses - Etsy。Early 1950s Mid-Century AO women\'s performance sunglasses in Bakelite tortoise cat-eye shaped frame, featuring *specialty, extremely high-tech Calobar lenses from American Optical. Calobar was considered pioneering, very next generation eye lens innovation! The original Calobar eyeglass lens was a green tint; but, these early AO women\'s eyewear feature the Amber/ tan Calobar lenses and they were a more limited specialized offering. The tinted Amber was considered a more rare Calobar formula, involving the addition of selenium & nickel to the iron oxide solution, creating a reddish-amber or tan, not the green, tinted lens. They were technically distinct from their classic green Calobar lenses in the late 1930s, 1940s, and into the 1950s. They were a non-military offering during this period, but this particular design appeared specifically on the specialized, early 1950s Bakelite cat-eye styles primarily in the late \'40\'s early \'50s, as well as in other fashion frames in from the l