Mirror sunglasses have a thin metal layer on the outside of the lens that reflects the glare on the sunglasses rather than letting it in, thus reducing the amount of light entering the eye. This makes them look like one-way mirrors when viewed from the outside of the sunglasses. Lenses may look opaque due to reflective coatings, but they do let enough light through to help you see with minimal eye strain.

They are an excellent choice for outdoor activities where glare is a concern in very bright conditions, for example, snow sports on sunny days, as they protect your vision by reflecting the light on the lenses.

Of course, when choosing any type of sunglasses, protection from harmful UV rays should be your top priority. From then on, you'll want to consider any safety and performance requirements of your chosen outdoor activity before dealing with frame styles as well as the shape and color of your lenses - for example, if you're playing a sport that requires concentration, you want optimal vision (eyeglass online).

UV protection

According to the American Academy of Ophthalmology, UV rays can harm your eyes and can lead to the growth of things like cataracts, eye cancer, and pterygium. Photokeratitis (a type of corneal sunburn commonly referred to as snow blindness) can also occur at an alarming rate without proper protection against light reflected off surfaces such as snow, sand, or water.

Wearing sunglasses outdoors during the day is the best solution to protect your eyes. It's also important to wear sunglasses on cloudy days, because ultraviolet light can penetrate clouds - meaning that even if the light around you is dimly lit, you can still feel the glare of light bouncing off a reflective surface.