What is the difference between expensive and cheap glasses?

1. The design is different.

**Glasses pay more attention to the sense of design, have high-quality designers in design, and ensure the popular appearance and structural safety of the product by continuously optimizing the appearance and structure. The products of independent designer brands, the designer's hard work and creativity not only beautify the decoration of glasses, but also improve the comfort and convenience of wearing, especially the excellent foreign glasses brands have invested very much in this regard.

2. The material is different.

The difference in material determines the texture, comfort and durability of glasses, and it is not easy for outsiders to see that cutting corners in this regard.

The level of glasses products is also intuitively reflected in the material: such as diamond cut glasses and titanium alloy.

Glasses will be a little more expensive, generally plates.

is slightly cheaper, and there are some big brands with platinum frames** Naturally, there is no need to say much. Cheap glasses are not so particular about the material, and the main thing is to control the material in order to reduce the cost.

3. The process is different.

The craftsmanship not only determines the delicacy of the appearance of the glasses, but also the processing technology level of the frames determines the accuracy of the glasses. Inferior frames cannot guarantee the accuracy of the parameters of the glasses, no matter how good the lenses are, and the actual parameters of the lenses may gradually change under the stress generated by the frame.

About lenses: lenses are mainly for your own use, so which lens you choose means (especially for people who wear glasses for a long time) that you will have the visual experience and use experience brought by the lens for a period of time; Good lenses are mainly experienced in good optical performance, that is, good realism of restoring things, small chromatic aberration, and a state that is infinitely close to the naked eye; High wear resistance and strong impact resistance during the time used under the same conditions; Good protection function; Good oil-proof, dust-proof and fog-dispersing ability; The more people rely on lenses to provide their own functions, the more expensive the lenses are, such as the current anti-blue light, anti-blue light, anti-fatigue, color-changing multi-effect protection, polarization, etc.; The more complex the luminosity and the higher the power, the more expensive it is, because you have to choose a thinner lens, and the thinner and smaller dispersion are more expensive. I believe that many sales people themselves are not very clear about the process of lenses and the experience characteristics of future use, so the brand just helps us to save time to identify faster, because it is the result of the experience accumulated by the public for a long time, so there is no need to worry about what is good, and the choice of brand is generally not too bad, then fitting is the key.

According to the results of your own optometry, combined with your choice of frames, consider your needs, and choose the right glasses for yourself.

3 frames: frames are generally purchased from its materials, processes, brands, face shapes, optometry data, etc., focusing on suitability and comfort, generally ** between 150-600 is good, if you add any big brand, it is estimated that there are thousands of them, the field of this luxury is estimated to have almost any goods with external decoration, there is no need to buy extraordinarily expensive, unless there is a mine ...... at home

Lenses do not have the effect of adjusting vision, and it can only be said that some progressive films can help the ciliary muscles of the eyes to adjust less tired. The quality of the lens is mainly determined by the light transmittance, spherical aspherical, refractive index, and the quality of the coated film. The higher the refractive index, the thinner the lens, the more expensive it is, and it plays an aesthetic role for some people with a high number of heights.

The main difference lies in the difference in the material and the brand. Generally speaking, expensive ones are clearer, stronger, more wear-resistant, and so on than cheaper ones, ......and so on

It is very practical to have Gangsi lenses, easy to clean and super wear-resistant!

1. The effect is different: first of all, the requirement of sunglasses is to be able to achieve the effect of anti-ultraviolet rays, and the wavelength of ultraviolet rays is to 380, so the most basic requirement of sunglasses is to UV380 or more. Generally, it is UV400, and poor sunglasses cannot achieve such an effect, so the damage to the eyes is greater than that of not wearing it.

Because when people have dark vision, that is, when they wear sunglasses, their pupils are dilated, if you don't have the function of UV400, then ultraviolet rays will enter the eyes more, causing the chance of cataract occurrence to increase exponentially.

2. Different grades: high-end sunglasses belong to designer brands, and their shape, collocation, and fashion are the most cutting-edge and trendy, and can improve your grade.

3. Different materials: the material of high-end sunglasses again, the frame is mostly used for titanium alloy or pure titanium, Z titanium, ex titanium, etc., some of this material is used in the medical field, such as the stent for heart surgery, which is completely pollution-free, and the specific gravity is lighter than inferior sunglasses, and the electroplating process of titanium alloy is very good, and it will not fall off the paint and deform.

No, there are many types of frame lenses now, and you must choose the right one according to your actual eye situation, such as juvenile myopia, which needs to be considered for prevention and control rather than other higher-end lenses, and anti-fatigue and anti-blue light for many electronic products;

All things considered, the higher the refractive index of the lens, the thinner and lighter the lens.

However, the specific eye power and what refractive index lens is suitable for depends on the results of the eye refraction examination. Of course, the cost of specific glasses still depends on various factors such as the lenses and frames of the eyes, which may range from three or four hundred to thousands of yuan, which can be chosen according to one's own economic ability.

But after all, it is already myopia, in addition to wearing the right glasses, you also need to pay attention to:

1. The time of close eye use should not be too long, every 40-50 minutes, you should take a little rest for 3-5 minutes, and look into the distance to relieve visual fatigue.

2. Read and write, play with the computer, maintain a correct posture, the height of the table and chair should be appropriate, and the distance between the eyes and the reading materials should be about 33 cm.

3. Mix whole grains, meat and vegetables, eat more vegetables and fruits, and don't eat partially. Lack of vitamins in food is prone to night blindness and dry eye disease, and lack of trace elements chromium and calcium in food makes it easy to suffer from myopia. In addition, it is also necessary to pay attention to regular supplementation of eye vision nutrients, not from the nutrients required by the eyes, enhance the anti-fatigue ability of the eyes, and better protect the eyesight.

Fourth, when reading and writing, the light should be moderate, not too strong or too dark, and the light should come from the left front, so as not to obstruct the vision of the hand shadow. The light should be soft, if it is incandescent, it should be between 25 and 40W, and it is not recommended to read in the sun. Because the intensity of light has a direct impact on pupil dilation, too strong light will increase the intensity of eye accommodation, aggravate the intensity of eye labor, and it is easy to cause myopia after a long time.

Generally, desktop lamps should be less than 40 watts.

5. Avoid reading while walking or reading in a walking car. Because the carriage is shaking, the body is shaking, and the distance between the eyes and the book cannot be fixed, the burden on the glasses will increase. Often, this is likely to lead to myopia.

6. Actively participate in physical exercise to enhance physical fitness. As the eyeball follows the target, the ciliary muscles continue to relax and contract, and the synergistic effect of the extraocular muscles can increase the blood perfusion of the eye, promote the metabolism of the eye, and thus reduce eye fatigue. Moreover, the quality of physical fitness is also closely related to the occurrence of myopia in children.

Malnourished and weak children are prone to myopia.

7. Insist on doing proper eye exercises. By massaging the acupuncture points around the eyes to enhance the blood circulation of the eye socket, improve neuronutrition, eliminate the excessive congestion in the eye, and achieve the purpose of relieving eye fatigue, it is conducive to the prevention and treatment of pseudomyopia in adolescents, and is a good way for adolescents to self-care their eyes.

8. Eat less candy and high-sugar foods. Too much sugar will produce a large amount of acidic substances in the blood, and the acid will combine with the salt in the body, especially calcium, resulting in a decrease in blood calcium, which will affect the toughness of the eye wall, make the eye axis easy to elongate, and promote the development of myopia.

If you want to be smart with glasses, you are asking for trouble, because you will never spend less money and can't match good glasses, and you can also wear glasses on the Internet and it is very cheap, cheaper than regular lenses from the factory, what do you think you can match? When you buy a mobile phone, you need to look at the configuration, when you buy a car, you need to look at the configuration, and the lenses also depend on the configuration! Refractive index, material, film, brand, this is called the four major pieces, in addition to the same product is also divided into A goods and B goods!

As another person said, the camera lenses are all made of the same material, but the difference between the effect and the money is also very large!

The frame is good or bad, put aside the factors of asymmetry and flaws.

The workmanship of the material affects the durability and the difference in the length of time you wear it, but at present, the replacement cycle of glasses is only 1-2 years.

For the eyes.

The accuracy of the prescription and the quality of the lens have a greater impact.

Lenses** depend on several aspects:

1. Brand. At present, the more famous lens brands are Nikon, Essilor, TAG Heuer, Zeiss, etc., among which Zeiss is good at glass lenses. **A pair is basically more than 1,000 yuan.

2. Material. The slight difference in the material of the same plastic lens results in a different refractive index. This means that the higher the refractive index of the same power, the thinner the lens. Refractive index of resin sheets. Of course, the higher the refractive index, the more severe the dispersion. 3. Special lenses.

Some progressive lenses for the elderly, lenses with astigmatism, and self-tinting lenses are more expensive than regular lenses.

4.Optical properties of the lens.

Good lenses have good optical performance, poor lenses may have impurities, or they may not refract light well enough, which is harmful to the eyes, which is the same principle as the super expensive lens of a good camera (people who don't understand will think: it's just a piece of glass, why buy tens of thousands), and good lenses may also have the function of anti-ultraviolet rays.

There are two main differences

The first is the lens, the higher the refractive index of the lens, the more expensive the lens, and the difference between the lens film, there is an ordinary anti-radiation film, there is an ultra-waterproof anti-static acid-alkali oil-resistant film, such as a certain company's lotus film 502 on the direct slide away, the film layer is better than the ordinary green film lens regardless of anti-reflection or light transmittance, anti-reflection and wear resistance, the lens optical performance is stable and very durable, but it is more expensive.

It is usually many times larger than ordinary lenses, and there are lenses with additional functions, such as progressive lenses, photochromic lenses, ring focus lenses, etc.

The second is the frame, the frame plating of the frame is not easy to fade, not easy to molt, not easy to deform, will not be allergic, will not desoldering and other problems! There are many problems with poor frames, but you can wear them without paying attention to them.

Now we use the most plastic lenses, and there are many brands, from dozens of yuan to tens of thousands of yuan at home and abroad. In addition to the cost ratio of the brand premium, more of this is in the lens material and the processing itself.

The refractive index of a lens depends on the material used in the lens. In the case of the same center thickness, the edge of the lens with the same refractive index is thinner than that of the lens with a lower refractive index. When the brand is the same, generally speaking, we can judge the height of the lens from the refractive index, the higher the refractive index, the higher the **, and vice versa.

Good lenses, high precision, wear a long time to know that it is not easy to get tired, just this represents the difference between good lenses and garbage films, the other is durable, I am talking about the entry of single vision lenses, with Zeiss and Mingyue comparison, Mingyue lenses each point error may be within 10 degrees, Zeiss 5 degrees, comfort is not a grade, glasses are tired mainly or the quality is too poor your requirements are too low.

The difference between cheap spectacle lenses and expensive spectacle lenses is that spectacle lenses have different refractive indexes, and the higher the refractive index, the thinner spectacle lenses can be made. Due to the different basic materials of spectacle lenses, there are crystals, glass, resins, and some glass sheets have coatings.

If it is a highly myopic eye, it is necessary to choose lenses with a high refractive index, which will be thinner. If you choose lenses with a low refractive index, they will be very thick and heavy, which will be very inconvenient to work.

A "mature" spectacle lens is composed of a lens base and a multi-layer coating, which has the function of increasing the strength of the lens, improving the transmittance of the lens, and increasing the ability of water and oil resistance, so this layer of film plays a great role in the durability of glasses.