Vintage Ray-Ban Fantasees sunglasses c 1970s feature one of the rarest of all vintage Bausch & Lomb lenses - the ultra-gradient mineral glass lens. B&L Ultragradient lenses were the next and final step up in the B&L Ray-Ban product catalogue of the 1960s, 1970s, and early 1980s after which time this lens ceased to be made due to its high manufacturing costs. Their photochromatic properties on a clear lens made them unique for their time, for they darken significantly in sunlight and in a much faster period of time than any other lens B&L ever produced. The fact that they are essentially free of tint with a moderate mirror finish in the upper portion means that they can look and function much like regular eyeglasses when worn inside or in low light condition. This frees you from the necessity of constantly taking your sunglasses on and off when running errands and going inside/outside, but yet they provide superior glare protection and 100% UVA and UVB protection when outdoors. They look great in the unisex white gold Ray-Ban Fantasees frame measures approximately 5.5" temple to temple, and the B&L Ultragradient mineral glass lenses measure approximately 2.25" x 1.875" at the widest points. The top of the nose bridge is impressed B&L Ray-Ban USA. With original case, label and warranty! Will be sent well packed and insured with track & trace