Please note: transition means the color can transit from clear to dark gray not means bifocal or progressive. The stronger of the sunlight, the darker of the lenses will be. The lenses can't change color indoor or in the car.

Product description:

Lenses:1.56 index UV400 Photochromic Transition (Optional) Aspherical Lens

Strength: +100 to +400 by Increments of 25

Function:Transition Photochromic UV radiation reading glasses

Frame: Designer half rim frames

Size:

Lens Width:55mm/2.17''

Lens Height:33mm/1.30''

Bridge Size:17mm/0.67''

Temple Length:142mm/5.59''

Frame Width:133mm/5.24''

Package including: 

1 Pair Reading glasses