I just wanted to point out that most cheap (and therefore plastic) sunglasses are actually perfectly fine in terms of UV protection. Polycarbonate is UV opaque.

I just wanted to point out that most cheap (and therefore plastic) sunglasses are actually perfectly fine in terms of UV protection. Polycarbonate is UV opaque. If you Google this subject there are several websites where people went out and bought cheap an expensive sunglasses and had them tested and reached the same conclusion: UV protection does not justify expensive Raybans.