Date glasses / Photochromic sunglasses Frame: Khaki For indoor use, they function as blue light-blocking glasses. Outdoors, the lenses change color in response to UV light, transforming into tinted sunglasses. Recommended for those concerned about UV damage, those who find regular sunglasses too dark, and those who find switching between glasses and sunglasses troublesome♪ Fashion glasses, round glasses, Boston style, dusty green, cute and stylish, 2-way PC glasses