如何选购太阳镜（How to buy sunglasses）

如何选购太阳镜（How to buy sunglasses） 如何选购太阳镜(How to buy sunglasses) 1. Anti-reflective protective lenses: this lens is coated with a thin layer of magnesium fluoride to prevent strong light reflection, allowing you to see more clearly and undisturbed. To test whether your glasses really using antireflection lenses, glasses can be on the light source, if you can see purple green reflection, then said lenses do have painted antireflection protective film. Color lenses: also known as "dyed lenses", which are used in the process of making lenses, add a few chemicals to allow the lens to be colored to absorb light from a particular wavelength. This is the most commonly used type of lens for sunglasses. 3 color lens: the lens effect and color lenses is the same, only is made in different ways, it is the color painted on the surface of the lens, the most well-known is "gradually layer type the color of the lens", the color is the deepest, and then gradually down. Usually the sun glasses with the degree of the number of glasses are more than the coloring method to process the lenses. Polarizing lenses: to filter the rays of sunlight on the surface of the water, on land or in the equal direction of the snow, the special coating on the lens, which is perpendicular to the lens, is called a polarized lens. It's best for sea activities, skiing, or fishing, but it's not a normal daily life, especially when you're driving, because it's the opposite that makes you even less clear. Discoloration lenses: also known as "photosensitive lenses". Because chemicals in lenses to join silver halide, let originally colorless lens, meets the glare, becomes colored lenses, for protection, so it is suitable for indoor and outdoor use. Second: according to the confirmation, the best lens color of the sun glasses is the color of the tea, grey and green. Let's take a look at the protective effects of various colors. 1. Tea color system: the color of the tea color lens absorbs the violet and cyan of the light, and absorbs almost 100% of uv and infrared. Soft tones make eyes less tired. It's a very good protective lens. 2 gray contact lenses: fully absorb infrared, and most of the uv rays, and will not change the color of the scene. Mild and natural colors are a popular choice of lenses. 3 green lenses: like grey lenses can absorb all solitary 99% of infrared and ultraviolet (uv) light, the light of the green, red also can be blocked, but sometimes the color of the scene after the green lenses will be changed. But because of the cool and refreshing feeling of green, good eye protection, and the perfect choice of sunglasses. 4 red contact lenses: the red lens blocks the effect of ultraviolet and infrared light and the above three kinds of comparisons, which is a bit of a one-up one, and has a better barrier to some wavelengths with shorter wavelengths. The color of pink lens is downy, for a few match wearers, psychological help large effect of substantially. 5 yellow contact lenses: 100% yellow lenses can absorb ultraviolet and most of the blue light, absorb blue light, see the scenery will become more clear, so we can find that hunting and shooting, wear the yellow lenses when the filter is very common! Attention should be paid to the selection of sunglasses: Third: sunglasses are generally divided into sunshades, light-colored sunglasses and special use sunglasses. The so-called sunshade glasses, just as its name implies is used for shading, people usually take in the sun by adjusting the pupil size to adjust the luminous flux, when more than the human eye light intensity adjustment ability, will cause harm to the human eye. So in outdoor activities, especially in the summer, many people use sunshade mirrors to block out the sun, so as to reduce the damage caused by fatigue or glare caused by eye adjustment. Light color sunglass is not equal to the blocking effect of sunlight, but its color is rich, suitable to use with all kinds of clothing collocation, have strong adornment action. Light color sunglasses because of its rich color, the design is varied, received the favour of young gens, fashionable woman is more cosseted to it. Special use sunglasses have a very strong function of blocking the sunlight, often used in the beach, skiing, climbing and other sunlight is more intense field, its anti-ultraviolet performance and other indicators have higher requirements. Different people choose sunglasses according to different preferences and different USES, but the most basic is to start from the basic principles that protect the wearer's safety and eyesight from injury. The basic functions of sunglasses should be to reduce the intensity of light stimulation, clear and undeformed vision, uv protection, non-distortion of color recognition and accurate identification of traffic signals. If the function is flawed, does not light up the effect of sunglasses, it will produce consciously don't adapt to the symptom such as dizziness, eye acid bilges, argue sometimes slow to respond, color illusion and depending on the walk of unequal symptoms and cause traffic accidents, etc. So choose the sunglasses cannot focus on the style only and ignore its inherent quality. Consumers should pay attention to the following points when shopping for sunglasses: 1. Firstly, you should know the purpose of choosing sunglasses From the categories of sunglasses introduced above, we know that different types of sunglasses have different application occasions and people. Should we choose to buy sunglasses first to determine whether the purpose is to shade the sun, or to decorate for the clothing? Is there a requirement for uv protection in addition to sun shading? Are there any special requirements for the safety of the lens? Only by clarifying these purposes, and combining the design and the actual effect of wearing on the face, can you buy a pair of suitable sunglasses. 2. Learn to read product logos Not all sunglasses have an anti-ultraviolet function, and a pair of sunglasses that meet the basic requirements of the standard can only say that they are blocking the strong light while not penetrating more uv light. If only a pair of sunglasses to block light, but not cut off with the same amount of uv light, for the wearer will accept more than not wearing sunglasses uv light (wear sunglasses, will reduce the luminous flux into the human eyes, the wearer pupil enlargement). On the shop counter sales of sunglasses, the lenses, tag or on the packaging usually have obvious signs, as the fabric composition on clothing label, when consumer is bought be sure to check carefully. 1) the identification of anti-ultraviolet function Whether a pair of sunglasses has anti-ultraviolet function, we can not use the naked eye, the manufacturer's express commitment to the product is the only reference for consumers to buy and protect the sunglasses. We can see the labels and glasses of some products such as: "100% anti-uv", "UV400", "block all uv", "uv" and other express signs. Ultraviolet ray refers to the solar light of wavelength between 200nm and 380nm, including three types: UVA wavelength is 315nm ~ 380nm, UVB wavelength is 280nm ~ 315nm, UVC wavelength is 200nm ~ 280nm. The sun's rays reaching the earth's surface (290nm ~ 2000nm) account for about 13% of the uv light, with UVA accounting for 97%, UVB 3% and UVC close to 0. Ultraviolet radiation to the human eye injuries mainly depends on the wavelength of ultraviolet light, radiation time and radiation intensity, the strength of the defense mechanism, the human eye and cornea, lens uv damage are the most common eye tissues, sunlight keratitis and corneal endothelial injury, daylight cataract is the most related eye diseases. In order to protect the health of the eyes, you can choose the sunglasses with the anti-ultraviolet function, and try to eliminate the uv rays below 380nm. 2) identification of safety performance Sunglasses with safety performance, the lens using impact resistant materials, such as PC tablet on the label and manual tend to be marked "shock resistance" and "through the FDA certification", "conforms to the highest standards in Europe and America and so on, if the product can meet the requirements of logo on, motorcyclists, drivers, etc have special request for the safety of consumers is a good choice. Commitment to the product identification, consumers should learn to protect themselves, keep the label or instructions or good, or let the merchants marked on the invoice, in the event of dispute, we would not be a lack of evidence and passive. 3. Have basic skills to identify the inner quality of the lenses 1) the number of lenses should meet the requirements of the flat lens and should not affect the optical defect of the vision. Simple identification method for, can put sunglasses in sight, observations of distant places through the lens, such as window frame or door frame, then glasses from top to bottom and move around, goals should not have swings and wavy deformation. 2) the color of the lens should not be biased. The color of the surrounding environment should not be distorted, and the edges of the objects have the ability to effectively recognize different color signals. The color of the lens is very shallow, depending on the location of the desired activity, the color of the lens will affect the shading effect for different light sources and occasions. To make sunglasses effective in blocking summer bright lights, the colors of the glasses are deep enough, but don't choose the lenses that are too dark for cycling or driving. Wearing sunglasses should not be easy to develop eye diseases, cloudy days and indoors no need to wear sunglasses. Some people all occasions, regardless of sunlight intensity, even during the evening and in the evening, also wearing sunglasses when watching a movie, TV, it will inevitably increase burden of eye accommodation, cause eye muscle tension and fatigue, make the vision loss, blurred vision, serious can appear the symptom such as dizziness, not long. 's instinct, human have ego to protect eyes meet with strong light, the pupil will naturally become smaller, cut into the eyes of uv energy, once without uv protection function on the glasses, can make the pupil dilation, plus the role of the glasses not isolate uv, is equal to the portal open eyes at this moment, let the ultraviolet light to enter, The damage to the eyes is predictable. Sunglasses can block ultraviolet light, because the lens and add a layer of special coating, and inferior sunglasses not only can't block ultraviolet light, also let the lens completely the serious decline, make the pupil larger, ultraviolet ray can raking instead, damage eyes. In addition, inferior lens also causes the person to appear disgusting, forgetfulness, insomnia and other vision fatigue symptom. The color of the sun lens is light grey, tea or light tobacco, followed by green, amber, blue, etc. Red is used only as sunbathing or snow.