a variety of sunglasses

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Sunglasses is a strong incentive to prevent sun damage caused by the human eye vision insurance Sunglasses Health products, as people’s material and cultural level, but also as a cosmetic or sunglasses reflect the personal style of special jewelry. As the sun reaches the earth’s surface contains UV light, the human eye’s cornea and lens are the most susceptible to UV damage to eye tissues, and "cataract" is closely related eye diseases. Due to environmental damage to the ozone layer, and an increase in people’s summer outdoor activities, UV damage to the human eye can not be ignored. Wear sunglasses to protect eyes   from UV damage better way, but pay special attention to the choice of sunglasses. In accordance with the provisions of international standards, sunglasses, eye protection products are classified as areas of personal, because wearing sunglasses in the summer, the main function is to block the glaring sun. However, the international standard sunglasses again subdivided into "fashion mirror" and "general purpose use the mirror." Standard of "fashion mirror" of relatively low quality requirements. Because "fashion mirror" the main highlight is the style, the wearer is the focus of decoration rather than protection. Standard of "general purpose use the mirror," the quality requirements are more stringent, including UV and refraction and the prism of the indicator. Edit this paragraph the basic functions A pair of sunglasses looks very simple, that is some kind of plastic or metal frame, there are two colored glass or plastic film. What could be more Sunglasses Plus simple it? In fact, the two glass lenses can produce a lot of difference when you use sunglasses, these differences will you have a great impact. In this article you will learn all kinds of differences do exist between the sunglasses. A pair of good sunglasses must have the following four functions: To prevent the sun’s ultraviolet radiation UV rays can damage the cornea and the retina, high-quality sunglasses can completely eliminate the ultraviolet radiation. Prevent light exposure When the eye receives too much light, it will naturally shrink the iris. Once the contraction of the iris to the limit state, then people need to squint. If the light is still too much,  such as snow reflected sunlight, will produce damage to the retina. High-quality sunglasses can filter out 97% of eyes light up in order to avoid injury. To prevent the glare of the light Some surfaces, such as water, can reflect a lot of light, and this will disrupt the line of sight produce bright or hidden objects. The use of high-quality polarized sunglasses can completely eliminate such glare technology, we will introduce later polarizing technology. Eliminate specific frequencies of light Certain frequencies of light will blur the line of sight, while some other frequencies of light can enhance the contrast. Choosing the right color for the sunglasses, making it in certain circumstances get better results. If the sunglasses do not provide UV protection, it will give you more exposure to ultraviolet irradiation. Cheap sunglasses filter out a portion of the light, causing your iris to open to receive more light. This will let more UV rays to enter, increasing the UV damage to the retina. Therefore, a variety of sunglasses, there is a difference between really. For a particular use environment, the selection of suitable, high-quality sunglasses will provide you with maximum protection. [1] classification Edit this paragraph Use classification Sunglasses can be divided into shade by use of mirrorslight-colored sunglasses, and three types of special-purpose sunglasses. Sunglasses The so-called sun mirror, suggests that it is for shade purposes, people often rely on the adjustment in the sun to adjust the size of the pupil luminous flux, when the light intensity of more than ability to regulate the human eye, it will cause harm to the human eye. So in outdoor activities, especially in the summer, many people use sun mirror to block the sun, the eyes adjust to reduce glare caused by fatigue or irritation caused by the injury. Light-colored sunglasses, blocking the sunlight as the sun mirror, but its rich colors, suitable for use with various types of clothing with, has a strong decorative effect. Light-colored sunglasses because of its rich colors, styles, by the young people of all ages, women’s fashion is fallen in love with it. Special purpose sunglasses block the sunlight has a strong functions, commonly used on the beach, skiing, hiking, golf and other outdoor more intense sunlight, the UV performance and other indicators have higher requirements. Different groups of people, depending on the preferences and choose sunglasses for different purposes, but the most fundamental is to protect the wearer from safety and vision does not damage the basic principle. Reduce the light stimulation, visual clarity without distortion, anti-UV, no distortion of color recognition, accurate traffic signal recognition, should be the basic functions of  unglasses. If there are defects in these functions, ranging from sunglasses to lose the role of weight will produce dizziness, eye soreness and other symptoms consciously meet, and sometimes slow to react, argue and walk visual color illusion inequality symptoms and lead to accidents and so on. So I chose not to focus only on style sunglasses to the neglect of its intrinsic quality. The classification of sunglasses lenses Sunglasses lens types can be divided into: Anti-reflective protective lenses