Will it fit my prescription glasses?

It is made to accommodate most prescription frame and lens shapes, but the aviator cut fits best on frames close to that shape. Check the width and height of your lenses against the clip-on before buying.

Does it really block UV and cut glare?

The lens is polarized TAC with 100% UVA and UVB protection. Polarization is what removes glare reflected off water, snow and pavement.

What does the flip-up hinge do?

It lets you tilt the lens up and out of the way when you go indoors or into shade, without taking off your glasses. You keep your prescription vision in front of you the whole time.

Can I use it over the windshield while driving?

Yes, the polarized lens reduces road and dashboard glare. Keep in mind that polarization can darken some LCD screens and certain tinted car glass.

How do I care for the lens?

Wipe it with a microfiber cloth and keep it in a case when off your glasses. Avoid paper towels and harsh cleaners, which dull the TAC lens and its coatings.

Is it a replacement for prescription sunglasses?

It gives you polarized sun protection over your current glasses, but it is not a prescription lens. If you want a slimmer, lighter setup, dedicated prescription sunglasses are the alternative.