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 overview:
Lenses:1.56 index UV400 Photochromic Transition (Optional) Aspherical Lens
Strength: +2.00
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''