Available only from Hammacher Schlemmer, these are the sunglasses with variable tint lenses that adjust to UV light conditions in as little as 30 seconds. The glasses have a built-in bifocal prescription and use photochromic lenses that block harmful UVA/UVB rays and glare. The lenses have a scratch-resistant coating for durability and the frames are made from lightweight yet durable plastic. With an adjustable, non-slip nosepiece, smooth rubber temple pads, and a hard-sided travel case. Gloss Graphite. Specify magnification: +1.5, +2.0, or +2.5.