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How do you know when the polarization in your shades is wearing out?

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Answered 2006-12-26 13:58:08

A test would be to find a car with stock AC after 1994, put on your polorized shades and look at the side or back windows. You should see different shades of squares. The windows are made with a coating to help keep in the AC better. Your glasses let you see this, but because the glass and you are at different angles, you see different shades with your shades.

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