An addition to my previous reply, i have not seen actual GLASS eyeglasses in several years, the new high performance plastics are far better. I have been wearing glasses for over 60 years, and have found the plastic to be very good. My current ones are at least 2.5 years old and in near perfect condition with plastic lens.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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