I am highly skeptical of getting a decent pair of glasses for $20-ish. (Though admittedly my current pair are about 6 years old. Since my prescription doesn't tend to change, quality is more important to me since I don't have to buy them so often).
I am also skeptical of getting right fit, etc.
BUT, it does sound like an awesome idea for a backup pair of glasses. Next time I order some glasses I may get an online backup pair to test them out. Maybe for some sunglasses? Definitely some interesting feedback.
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