Very bad lens quality. I bought these to see if driving with bifocal lenses would work. Conceptually it worked, but some of the over the counter sunglasses were of such poor quality that it was better to ride with my regular sunglasses instead. If you need bifocals for reading the gauges while driving but don't need prescription sunglasses for distance, this probably isn't the best option (find a better pair). If you just need some disposable readers for a day at the beach I think it will be fine.
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