somebody wrote:
In message , Doki
writes

[snip]

them off. My bird used to work repairing glasses and most frames end
up knackered because people stretch at the hinges taking them off
with one hand.

I would suggest that if as you say, that taking them of with one hand
is what 'most' people do, then the frame manufacturers have failed to
provide a product which is even close to meeting 'most' of their
customer needs.

viz
Ford: Yeah we have a problem with people trying to start our cars.
Engineer: Well, thats their problem, they should know better.
/viz

I do not doubt your or your 'birds' view, and I do understand that
neither of you are the designers of such frames but I really don't
accept it is my fault. I'm right handed, it is how I was born.

Most people also replace their frames every time their prescription changes.
Sprung hinges go some way towards reducing the problem, but eventually play
develops in the sprung part of the hinge. The only other option is to make
the glasses so rigid that people can't take them off by stretching them
around their head, and I doubt people would buy glasses that heavy or bulky.

IMO it's more akin to getting in and out of your car via the windows and
then complaining that the doors all scratched. It is something that should
be mentioned when people buy glasses or bring them in for repair.