the disclosure of ultraviolet

A pair of sunglasses may seem very simple - it is two pieces of stained glass or plastic in plastic or metal framework of certain types of. How simple can get something? In fact, you can do the two pieces of glass, there are some different things, but these things you may have a great achievement, when you use the camera. In this article, you will see, is in fact a different sunglasses, you'll find out there is a gap.
There are four things, which you do as a pair of sunglasses with a high quality:
* sunglasses, in the sunlight ultraviolet defender. Ultraviolet (UV) light injury of cornea and retina. Good sunglasses can completely eliminate ultraviolet.
* Sunglasses provide powerful light guard. When the eyes receiving additional light, which obviously close. Once it has been closed, because it can iris as much as possible, then steps to. If there is excess light, there may be shining in the sun under the snow off, the result is damage to the retina. Good quality sunglasses can block the light entering the eye along the damage up to 97%.
* Sunglasses provide protection glare. Some surface, such as water, can reflect a lot of light, bright spots may be unsettling, or may conceal objects. Good sunglasses can completely eliminate glare by polarization of this type.
* Sunglasses eliminates specific frequencies of light. Some frequencies of light, blurred vision, and some other can improve the contrast. Your sunglasses to choose the right color, let them in specific circumstances, superior work.
When you buy a pair of sunglasses cheap, you often give up all these advantages, it could even make things worse. For example, if your sunglasses do not provide UV protection, increase the disclosure of ultraviolet. Cheap sunglasses block some of the light, causing your iris open, to allow more light. This makes more UV light too, increased UV may lead to retinal light damage.