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All  |   Discussion (0)Sunglasses

Sunglasses should be 100% UV resistant, as well as polarized (unless you are flying aircraft), and should wrap around your face so that light cannot get around the side of the frame. Test if they are polarized by looking at a computer screen with them on. If the light intensity from the screen changes as you tilt your head at various angles, then the lenses are polarized. Polarization test cards are also available which reveal hidden objects if viewed through a polarized lens. It's not so easy to test whether the lenses block UV light. Cheap UV meters are available (less than $10) on places such as Aliexpress. Even better is to have the lenses tested at your local optometrist.   thesource (378)     Click to enlarge

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Different color lenses are for different purposes: - Black, gray, smoke, or mirror lenses are best for bright conditions. The color that you see through the lens remain similar to what you normally see, though will be darkened. - Brown is a good all-round lens, which is okay for bright light, but will also improve contrast, clarity, and depth perception. - Amber or orange lenses are not the best for bright days, but can help increase contrast on cloudy or overcast days, as they filter out blue light. Blue light diffuses easily, decreasing the contrast of what one sees. - Yellow lenses can increase clarity in foggy and hazy conditions. These also work by blocking blue light. These are not designed for bright days.   thesource (378)

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