I got a pair of these just before Christmas and they've really helped - I tried "occupational lenses" which are a strange bifocal with a central focus of 3ft and then outwards it changes to the reading prescription, did not work with how I use the display in that my head is usually fixed and I move my eyes.

The intermediate distance lenses are great and my headaches have vastly reduced - because they were specific for VDU, my work paid for a portion of them.