Wearing a pair of glasses not suitable for you, serious words will affect your vision, and even become the eyes of the “killer”, resulting in the consequences of blindness. At present, there are three common misconceptions about glasses: computerized optometry as “prescription” Choose medical optometry, which is a prerequisite for accurate prescription. Compared to traditional medical optometry, computerized optometry is convenient and fast – put your head on a special instrument and stare at the image of the screen with each eye, as soon as you see a clear OK! “However, Kang Ying cautions against using computerized optometry as a prescription. Especially for teenagers, computerized optometry is likely to turn “pseudomyopia” into “true myopia” because it is easy to “overcorrect”. Analysis: The parameters of computerized optometry are set by the average of human visual acuity, so there will always be a “gap” between computerized optometry and each person’s true visual acuity. Accurate optometry should not only take into account the refraction of a single eye, but also the balance of both eyes, while computerized optometry is usually one eye at a time, which certainly can not take into account the coordination of both eyes. More importantly, for people, especially adolescents, refractive error cannot only be standardized by static refractive error, but should be done after dilated pupils in order to get the true refractive error number. Computerized optometry is a greater danger is to cause the prescription lens degree “overcorrection”, myopia correction degree should be the lowest degree of best vision, but many businesses are to consumers with “see the most clear” degree, in fact, this degree belongs to In fact, this is “overcorrection”. Long-term wear of such glasses in order to adapt to the eyes of this degree, vision will quickly decline. A large number of surveys, especially for those who have been wearing glasses for many years, show that the likelihood of visual fatigue is extremely low when wearing frame glasses after passing medical optometry. Reminder: I. The following people must undergo medical optometry: 1, youth under 15 years old. 2, first time wearers of glasses. 3, wear glasses with visual fatigue. 4.Both eyes refractive disparity. 5.Persons who have suffered from eye diseases. 6.Those who need refractive surgery. 7, short-term myopia increased quickly, such as within six months deepened by 100 degrees. Second, the optometric cycle: 18 years of age or younger due to the process of eye development, if myopia must be a medical optometry every year; if farsightedness every six months to be carried out. The second misconception is that thin lenses are good and expensive materials are good Are the thinner lenses better and are the more expensive materials better? The answer is no. Generally speaking, the thinner the lens, the better the light transmission. But it is not the same as the higher the light transmission rate. Moreover, if the lens is less than 300 degrees of myopia, the lens itself is not thick, so there is no need to spend a lot of money to match a pair of ultra-thin lenses. In terms of material, crystal lenses, which are expensive, have been promoted in the past, but in fact, crystal is not suitable for lenses. Crystal hardness, not easy to wear, but natural crystal impurities, easy to appear streaks and bubbles, light through the double refraction, resulting in superimposed shadow. Moreover, its high transmission rate of ultraviolet and infrared rays makes it less protective than ordinary optical lenses. People used to admire crystal lenses because of their low absorption rate of ultraviolet and infrared rays, and the relatively low temperature of the lenses, which makes them feel cool. Analysis: The lenses are divided into three main categories from the material: glass, resin and space lenses, each with its own characteristics. Glass lenses have superior optical properties, are not easily scratched and have a high refractive index. The higher the refractive index, the thinner the lens. Therefore, glass lenses are recommended for people with high myopia over 1000 degrees. However, glass lenses are fragile and heavy, so fewer and fewer people choose them. Resin lenses are light, unbreakable and have good UV protection. Most people prefer to use them. The advantages and disadvantages of resin lenses depend on a variety of factors (new lenses will be marked): 1, refractive index: the higher the refractive index, the thinner the lens, the price is also relatively high. 2. hardness: resin lenses have low hardness and are easy to scratch, but the hardness of resin lenses can be increased by hardening them with anti-flower treatment. 3, add film: add film can reduce the reflection of the lens, increase the light transmission of the lens, improve clarity. 4, UV protection factor. 5, aspheric design: that is, the lens is relatively flat lens, can achieve a clear and comfortable visual effect. Space lenses, also known as PC lenses, but more resistant to impact than resin lenses, thinner and lighter, can prevent UV rays below 380 nm. They are generally recommended for people who love sports or outdoor activities. Reminder: people with high myopia should use aspheric lenses with high refractive index, which are thin and beautiful. For low myopia, it is not necessary to choose high refractive index, but 1.5 or 1.56 refractive index. Moderate myopia, you can consider low refractive index aspheric lenses, the same can achieve the effect of high refractive index. Misconceptions of three trendy Hing “no nose bracket frame” recently Europe and the United States and other countries many brand-name eyeglasses brand have launched a series of “no nose bracket” frame, that this frame is more “fashionable”. This fashion is sought after by teenagers in large cities in China. But this “no nose bracket frame” is actually not suitable for oriental people, because the bridge of the nose of the Oriental people is generally not high, relatively flat, the best choice of frame with a nose bracket, easy to adjust the prescription, otherwise it is easy to slip, but affect the visual effect, but also not conducive to correcting vision. Analysis: the choice of frames should be considered from the aesthetics, function and comfort of the frame. First, aesthetics: the shape of the glasses should match the shape of the face. For example, wearing round frames can eliminate the angles too obvious facial contours, square frames will add to the face of the angular sense. Second, function: that is, the function of the frame to support the lens, high number of lenses and aspheric lenses, need small size, symmetrical, round or square frame. Third, the comfort of wearing glasses: to choose a lightweight frame, especially children, the nasal bone is in the process of development, the total weight of the general glasses should be less than 15g, good elasticity, glasses frame easy processing is not easy to deformation, no irritation to the skin, but also not easy to be acidic secretions corrosion. Reminder: considering all factors, the choice of frames should be observed from several angles: 1, look at the surface: the surface is smooth, glossy, uniform color. 2, look at the “logo”: whether the frame is printed on the model, size, material, origin, etc., the logo is not complete. 3, look at the shape: pull the mirror leg, flat, to see whether the body and leg form a certain angle tilt, whether the frame is the same size, whether the parts are symmetrical, whether the parts are fine workmanship. 4, look at the combination of points: note whether the welding is smooth, whether the same height. 5, test its material: compare the feel and elasticity, can determine the merits of the material. 6.Shelf life: plating is generally guaranteed for more than half a year, and the shelf life of welding is generally six months to more than a year.