I bought these because I thought their frames would be much stronger than the other pair with wire frames that loosen constantly (& which, otherwise, I LOVE), and I am loving these.  The secure, sturdy fit is wonderful.

I particularly need the bifocal feature, with the lower part of the lens being my full reading strength need, and the upper portion having a intermediate strength helping me to read at an intermediate distance from the screen and reading material ---> This feature has revolutionized my computer work on a daily basis!!!!

These frames are nicely sturdy and maintain their shape & fit more constantly, as i take them on-&-off a lot throughout each day & night.  

I am very happy with these glasses.  Thank you! :-)