I have also considered this, as I need 1 pair of glasses to read, and another to drive/ride.
A friend asked his eye doctor about it and was told there are no studies available regarding the long-term effects as it hasn't been around long enough yet...
As much as I hate fumbling between 2 pairs of glasses, I can't "see" taking the risk. For all I know, it has the same validity as those pads that suck the toxins out of your feet.........
