Bifocal Transition Photochromic Acetate Spring Hinges Reading Glass Near Far

Up 0, down 100: Far Distance 0 Degree / Near Distance +100 Degree for Reading. up 0, down 150: Far Distance 0 Degree / Near Distance +150 Degree for Reading. up 0, down 200: Far Distance 0 Degree / Near Distance +200 Degree for Reading.