Regarding the Problem from Sunglasses

Sunglasses or better known as the sunglasses are of two types, sunglasses that are based on a doctor's prescription or who do not, What is certain types of glasses that this one has a darker lens that aims to protect the eyes from the rays of glare and ultraviolet rays.

Eyeglasses with photosensitive lenses, or Photochromic lenses are also called, is the glasses that will turn dark when exposed to ultraviolet light. Unfortunately, many car windshields that have been deter the arrival of this UV light, which makes Photochromic lenses become less effective when used to drive a car in the daytime, But, still, this one kind of glasses that provide comfort, where users do not need to bring a lot of glasses, let alone the frequency of indoor activities and the outdoor almost the same every day.

Polarization of light is an additional feature that was applied to the lenses of sunglasses. Polarizing filters remove horizontal polarization of light, which can cause a person to feel the glare. Type of glasses that one is usually used by fishermen and hunters, as it allows the wearer to see into the water when there is a reflection of the blinding light. However, these polarized sunglasses can also cause difficulties for pilots since reflections from water and other elements often make height measurement will be disturbed, or can cover the objects that should be read in the upper liquid.

Yellow lens commonly used by golfers and shooters to see the difference in distance and objects in more depth. Brown-colored lenses are also commonly used by golfers, but these lenses can cause color distortion, while the lens is blue, purple, and green just simply things that beautify. Because its function is very minimalist, could not provide tangible benefits for vision. 

Some sunglasses with lenses that can be exchanged repeatedly have lens options that can be used to protect the eyes from lack of light or evening activity and colored lenses with UV protection that will function when the eyes need protection.

Sunglasses are often used for the purpose of aesthetics, or to cover up tired eyes only. Examples of sunglasses that are often used for this purpose is teashades and mirrorshades.