When shoping for discount sunglasses, you need to consider what kinds of lenses you need: Plastic or glass? If plastic, the hard resin "CR-39" along with the light, strong polycarbonate lenses meet optical quality standards. Glass lenses will make your sunglasses heavier, but they won't scratch as easily. Cheap sunglasses cause images to distort, so try this test: Find a repeating pattern, like a tiled floor. Hold the sunglasses a few inches from your face, cover one eye, and move the sunglasses slowly up and down, left and right. Look through one of the lenses. The lines shold stay straight. If lines wiggle or seem to move, they're not optical quality and will distort your vision.

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