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posted 10mo ago by Olin Lathrop‭  ·  edited 10mo ago by Olin Lathrop‭

It depends on what the failure was.
If the hinge actually broke, then excessive repeated stress is probably the cause.  This is more likely to come from too much force trying to open the hinge past its limit than any working of the hinge within its design limits.  Some glasses have hinges that deliberately allow some over-opening, but with a higher torque required.  This is to minimize stress, and eventual failure.  I've had such glasses for enough years now to find that it helps.