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The way you plan to use your sunglasses is going to determine the tint you should have in the lenses. Outdoor sports require a tint that blocks most light. Ninety-seven percent or more is ideal. Going to the beach or driving in the sun means you need a tint that blocks 70-90 percent of the light. Sunglasses with tints that block 60 percent of the light don't offer much protection, but if you're planning to wear them for fashion purposes only, they're not a bad choice.