Best over the counter reading glasses I have owned.  Gradient lens adapts perfectly for my use at work (software developers) as eyes shift between items at a slighty different focal lengths.  Appear to be well constructed as they have lasted 10 times as long as my $5 glasses and much more comfortable  Update:  I have now owner 4 pairs of these.  Love the lenses and how they fit, but continual problem with arms breaking off with minimal pressure.  Now back to cheap glasses which oddly have sturdier hinge