How would you react if lenses were put into frames by a machine and held by an adhesive. You could still remove the lenses by use of a solvent. This could done with plastic and metal frames alike. This last step in making glasses has not been changed for many decades. Exception Polymil that used an adhesive and grooved lenses.
This would even work better if the frames had no groove but were flat in the eyewire. Metal frames would not have to open at all.
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