We use them also. DS has glasses, was told he needed bifocals also. DH wanted a second opinion so I went to Specavers & they agreed with everything except the need for bifocals. Got his glasses $170 for 2. Then he broke a pair from fiddling with them all the time. I tool them in to get a "quote" on fixing them. They took them, had them for about 2 weeks before I got them back but they didn't charge me a cent in repairs. Said it was under warranty. Even though DS broke them from fiddling. DS recently had a check up (8 months later) but with a bahavioural optometrist & he said his current glasses are just fine for what he needs. So Happy that I didn't use teh very first place & pay a heap of money more for frames we really didn't like but was the best they had for bifocuals he didn't need.