Is it possible to test which index your lens is?

[Britney]

Is there a machine that can test which index your lens is? I doubt that I've been ripped off for the wrong lens index.

[Yazmin]

Yes. The optician can use special machines to measure your lens. You can take your glasses to any optician and ask them to test it for you.

[Aubri]

There is no way to detect the lens index after they are cut. But an experienced optician should be able to feel the difference between a 1.56, 1.60 or 1.67 index lens. You can compare the thickness with your original glasses and figure out if the index is right.