“You can adjust the variation of darkness and control the transparency of your lens,” said Minoru Taya, professor of mechanical engineering at the University of Washington.

Sunglasses Change Color in yellow green purple

The lens material is made from a plastic, or polymer, that changes transparency when zapped with an electrical current. The whole lens includes a clear, protective layer, a base of titantium oxide and a gel-like solution in between the layers that helps transport charged particles. A watch battery delivers the charge. On the prototype glasses, the wearer spins a tiny dial on the arm to change color or shade.

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PCNews Verdict: 6/10. Sunglasses run by battery? No, thanks!

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