Blonde Girl Wearing Sunglasses In The Backyard

Flip-up sunglasses add the benefits of sunglasses to corrective eyeglasses, allowing the wearer to flip up the tinted lenses for indoor use. An alternative are clip-on glasses.
Mirrored sunglasses
Mirrored lenses, having a metallic, partially reflective coating on the outer surface, combined with a tinted glass lens, are an alternative to polarization for UV protection, improving contrast when depth perception is important such as seeing moguls and ice while skiing or snowboarding. The mirrored lens reflects glare to protect the eyes, but improves the ability to see contrasts, and mirrored lenses of different colors can expand the range of fashion styles. Their popularity with police officers in the United States has earned them the nickname "cop shades". The two most popular styles are dual lenses set in metal frames (which are often confused with Aviators, and "Wraparounds".