Is there any easy test to check UV protection of sunglasses?

Question

How can we know that the company guarantee of UV protection is true?

Answer 1

There is no test that can be done at home really..you would need a UV meter like most optical stores have.

But you can be 99.9 % sure that the protection is there.

Tests are done often , even on the cheap drugstore sunglasses and the UV protection is always good.