I believe this is a rare type, going from a light 10% tint to a darker shade. "Round Metal Eyewear, Crafted in Sabae City, Fukui Prefecture, the Home of Glasses" Round metal eyewear, slightly inspired by the Boston shape. Engravings on the bridge, hinges, temples, and rims express a retro feel. Photochromic lenses are used, reacting to ultraviolet light and changing color from clear to tinted. It's versatile, functioning as fashion glasses indoors and sunglasses outdoors when the lenses tint. This item is a standard size and can be worn by anyone, matching casual styling. ―DETAIL― ・Round metal eyewear, slightly inspired by the Boston shape ・Engravings on the bridge, hinges, temples, and rims create a retro feel ・Photochromic lenses that react to ultraviolet light ・A single item that works both indoors and outdoors ・Standard size that can be worn by anyone ―FABRIC― Antique Silver Photochromic 85%-10% ・UV transmittance 0.1%