I think the problem with real glass eyeglasses is that they are a lot heavier than plastic lenses.
Eyeglasses at Zenni.com are so inexpensive that I buy 3 or 4 pairs at a time, and if they get scratched, I just throw them away. Also, I like that their glasses include a lot of specs regarding the dimensions, weight, and overall shape and sizing. The selection is way better than at a brick and mortar eyeglass store.
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