Lenses:1.56 index UV400 Photochromic Transition (Optional) Aspherical Lens
Strength: +100 to +350 by Increments of 25
Frame: Designer half rim frames
Package:1 Pair Reading classes
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.
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