What kind of sunglasses should you chose to protect your vision?

Sunglasses can protect your eyes from harmful ultraviolet rays (UV) and high-energy visible light -- light from the blue part of the spectrum, implicated in cataracts and retina damage.

Wrap around protective sunglasses also shield away wind and sunlight that affects people with dry eyes.

Here are some tips when you chose sunglasses.

Claims. Labels for sunglasses are not regulated and are often inconsistent and confusing. A sticker that says "blocks UV" or "UV-absorbent" is meaningless because it doesn't tell you how much UV is blocked. Sunglasses with stickers that claim to block a specific percentage of UV, such as "99% to 100% UV absorbent."  is a better choice

Are darker sunglasses better?   Darker lenses don't mean better UV protection. Unless darker lenses are fabricated to block UV, they can be more harmful than wearing no sunglasses. That is because they cause pupils to dilate, allowing more UV light into the eyes. Lenses should be dark enough so that you can't see your eyes when looking in the mirror, but light enough to see curbs, stoplights and stairs.

How much should you pay?   It's possible to find great, protective sunglasses in the $20 to $60 range. More expensive sunglasses are not necessarily better, but super-cheap sunglasses (less than $20) are less likely to offer adequate protection.

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