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•Look at something with a rectangular pattern, like a tiled floor.

•Hold the glasses at a comfortable distance from your face and cover one eye.

•Move the glasses slowly from side to side, then up and down, looking through the lenses.

•If the rectangular lines stay straight, the lenses are fine. If the lines are wavy or wiggle (especially in the center of the lens), try another pair.Sunglasses should have the largest lenses possible to protect your eyes from sun damage. Consider oversized or wraparound-style sunglasses to limit UV rays from entering from the side