The glasses are hard to use. They came more or less bent on me. 2 pcs were. So bent that they could no longer judge. At one of the spectacle nose bridge missing links. 2 glasses I could turn so that they are "normal" usable. However, it appeared on the first extended-wear (approx. 3 hours) that the eyes very quickly fatigued and hired strong headache. When I took my old glasses, the headache was gone in a short time. This attempt I have made 2 times, with the same result. I have disposed of the glasses and not a complaint, because actually I was even foolish and rather naive if I believed at that price to get 5 usable eyeglasses. My tip - stay away!
