Photochromic transition aspheric resin lens , Lens Index 1.56.
Strength: +100 to +300 by Increments of 50.
Frame: Aviator style/Alloy Frame and size fits most face shapes.
Photochromic lenses shift from reading glasses indoor to reading sunglasses outdoor, also you can use it as normal photochromic sunglasses,Radiation protection, UV protection.
Comes with a case,This Reading glass also can be a perfect gift to your parents and the elderly.