Do these work over any prescription glasses?

They are made to clip onto most standard eyeglass frames. Very thick frames, small lenses or unusual shapes may not hold the clip securely.

Are the lenses really polarized?

The product states the lenses are polarized and block 100% of UV. Polarization is what removes glare from water, snow and car hoods.

Yes. The clip-on design lets you flip the lenses up when you go indoors, so you keep your prescription glasses on.

They add thickness to your glasses, so a standard hard case may be tight. A larger case or the supplied pouch is safer.

Polarized dark lenses are for daytime glare. For night driving, look for a clear or yellow clip-on instead.

Use a microfiber cloth and lens spray. Avoid paper towels, which can dull the scratch-resistant coating.

At Charmoo, for $19.99, as of our latest check.

$19.99at CharmooChecked Nov 12

Prices are checked against each store and labelled with when.

It checks today's price at every store, compares the alternatives and answers in about a minute.