My problem is that I only need glasses for reading or computer work (or close detailed work). So I put them on and take them off all the time, and whenever I put them down somewhere they are in danger of being bumped or sat on or whatever. Inevitably I damage them. I have one pair of titanium frames that were pretty expensive but lasted me a very long time and are still good except that I can't get one of the screws out. I've tried my local optometrist and they can't get it out either, to change the lenses. I will take it to the bloke near Mum and Dad's place next time I go up there and see if he can do it, because they are a great frame and with new lenses they'd probably last another 10 years.