Using them is horrible, feels unpleasant in the eyes after 1 minute of wearing, if I keep wearing I have headache and want to vomit... seems like the glasses distort very much the picture which makes it insupportable. I wanted to open a dispute but the website had issues several days in a row. may be it's a defect, I don't know. I wish the seller sends one more pair so I can change my mind and leave additional feedback. glasses are beautiful, the quality of construction is very good. but the glass makes me feel sick, sorry...