Ground & Polish Optical Glass makes the clearest lenses because it is free of bubbles seeds or haziness that can distort vision. RX able frame with spring hinge and 8 base curve. It also has Anti-Reflective coating which is a violet-colored coating on the back of a lens that prevents sunlight from coming in from behind and reflecting off the back of the lens into the eyes. This coating is most useful on water or snow.
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