Now that the sun's rays are shining brighter, what should you look for when it comes to sunglasses

Pick a pair that blocks 99 to 100 percent of UVA and UVB rays, absorbs UV up to 400 nanometers, or meets American National Standards Institute UV requirements.

Then test lens quality: Close one eye and move the shades from your forehead to your face. Repeat with the other eye closed. Do objects shift? The movement should be minimal and in the same vertical direction in each lens.

Choose glass lenses for your main frames. Glass offers the best optical quality to help you avoid eyestrain. You also want a gray tint (for undistorted colors) and polarization (to block glare). For casual wear, metal frames are best because they're durable. 

You want lenses that are made of strong yet lightweight polycarbonate; make sure they're interchangeable so you can swap in sport-specific tints. For example, the red lenses add contrast against green surfaces, which is good for mountain biking and tennis. And check that the frames have nose grips, so they stay put.

Go with yellow-tinted, polarized glass lenses. They let in enough light that you aren't driving blind if the sky clouds up. In an Australian study, drivers with yellow shades had faster reaction times than those with neutral ones.