What do you mean by glasses?

Directory introduction

Bacon and glasses

The Origin and Development of Glass

The Formation and Development of Glasses Industry

Types of glasses

The Connotation of Glasses Culture

Common sense of buying glasses

Glasses aesthetics

Maintenance of glasses

Types of spectacle lenses

What if the ancients got myopia?

Antique glasses

brief introduction

Glasses are simple optical devices used to correct vision or protect eyes. Consists of lenses and frames. There are four kinds of glasses to correct vision: myopia glasses and hyperopia glasses, presbyopia glasses and astigmatism glasses. Eyeglasses for eye protection include protective glasses, windproof glasses and sunglasses.

Glasses are not only a tool to protect eyes, but also a beauty ornament. From the function of the lens, it has the functions of regulating the amount of light entering the eye, increasing vision, protecting eye safety and treating eye diseases clinically. Can be used for treating strabismus of children caused by ametropia and headache of ametropia patients after wearing glasses. The function of spectacle frame is not only to support glasses worn on people's eyes, but also to beautify and decorate them. Modern pop people emphasize that glasses should be coordinated with people's facial makeup and clothing, which embodies the symbol of superb social class, elegant knowledge and fashion.

With the rapid development of social technology, the continuous improvement of people's culture and living standards, and the development of vision care's work, glasses will play an important role in people's lives.

Bacon and glasses

/kloc-In the mid-3rd century, British scholar Bacon saw that many people could not read the words in books because of their poor eyesight, so he wanted to invent a tool to help people improve their eyesight. To this end, he thought of many ways and did many experiments, but none of them succeeded.

One day after the rain, Bacon went for a walk in the garden and saw many rain beads on the spider web. He found that when he looked at the leaves through the rain beads, the veins of the leaves were enlarged a lot, and even the fine hairs on the leaves could be seen. He was overjoyed to see this phenomenon. Bacon immediately ran home, rummaged through everything and found a glass ball. But through the glass ball, the words on the book are still blurred. He found a diamond and a hammer, cut off a piece of glass, and put the glass close to the book. The text was indeed enlarged. Bacon was ecstatic about the success of the experiment. Later, he found a piece of wood, dug a round hole, put a glass ball on it, and put a handle on it to make it convenient for people to read and write.

After continuous improvement, this kind of lens has become the glasses that people wear now. There are myopia glasses for teenagers, reading glasses for the elderly and glasses for other purposes, which are more convenient for people to study and work. Bacon contributed to the progress of human civilization.

The Origin and Development of Glass

According to the data, glasses first appeared in Florence, Italy in 1289. It is said that the most important tool in the world was invented by an optician named Amato and an Italian named Spina who lived in Pisa. Benjamin Franklin, an American inventor, suffers from myopia and hyperopia. 1784, he invented the dual-purpose glasses for farsightedness, avoiding the torture of changing two pairs of glasses frequently. 1825, British astronomer George Avery invented glasses that can correct astigmatism. Some people think that China people invented glasses 2000 years ago. Although it is still a mystery who invented glasses first, it is an indisputable fact that glasses appeared in China in the middle of the Ming Dynasty. In the second volume of "Stay in Youth Day" in the Wanli period of the Ming Dynasty, Heng wrote: "Every time you read an article, your eyes are tired and you don't know its details, so you can hide your eyes, keep your spirit, and write clearly. It was tied to the back of the head with silk, and no one knew, so I asked more questions. Yu Yu said, "That's right. "At this time, Babali is the original name.

There are not many images and physical materials of China's early glasses. In the Ming Dynasty oil painting "Du Nan Fan Hui Feng Guang" in China History Museum, there is an old man with glasses. During the Qianlong period of the Qing Dynasty, China was able to produce glasses. The frame is a black lacquered wooden frame with ribbons tied on it, and the lenses are made of crystal. During Jiaqing period of Qing Dynasty, glasses became popular. Zhang said in Xu Du Men Zhu Zhi Ci: "Anyone who is nearsighted wears glasses, and the shades in the shop are distinct. It is wise to raise your eyes and be more tolerant and fight for it. " Interestingly, the depth scale of glasses in Qing Dynasty was divided according to the twelve branches of Zi Chou Yin Mao, which was recorded in Li Guangting's Xiang Yan Jieyi, a historical book in Qing Dynasty. Since human beings invented lenses in the13rd century, they have been polishing lenses with crystal glass. 1937, France invented a plastic spectacle lens called acrylic, which is not fragile, but has poor clarity. 1954, an engineer from the Izuru company in France was inspired by the materials used to make the cockpit of an airplane, and thus invented the resin lens. Since then, this kind of lens has become the supreme lens kingdom in the world, and it is still in use today.

The Formation and Development of Glasses Industry

1. The formation of commercial gangs in Ming and Qing Dynasties

In the history of our country, with the development of individual handicraft industry, the use scope of glasses began to spread and expand to the people, and the production technology also developed new.

China Gusu (Suzhou) is the birthplace of China glasses. Suzhou's glasses production not only has a long history, but also plays a great role in promoting the development of China's glasses industry. In the early Ming Dynasty (A.D. 1628), an outstanding technician appeared in the history of Suzhou glasses. His name is Sun, his name is Wen Yu, and his name is Spencer. He was originally from Wujiang. He has been studious since he was a child. At that time, it was painful for him to see people with poor eyesight, but it was inconvenient to use a "single lens" mirror or the like. So he painstakingly developed a kind of lens that can be worn on eyes often. After repeated experiments, he invented and created a lens grinder-tractor by using mechanical principle. This tractor, the so-called water orange processed by the classical method, uses the pedal to rotate, and uses mineral sand, white mud and brick ash as abrasives or polishing materials to polish the lenses into convex and concave lenses to meet the needs of eye refraction. Finally, it mastered the "grinding" technology. Grinding lenses with natural crystal stone. At the same time, he mastered the technology of "aiming at light", developed lenses with various luminosity such as presbyopia, myopia and hyperopia according to people's age and vision, and compiled an original optometry method of "looking at the mirror with your eyes" to check the environment. In this way, the glasses can fit the eyes, the effect is not bad at all, and it is more convenient and comfortable to wear on the face to meet everyone's vision needs. This is the beginning of China's subjective optometry.

Later, Sun invented and developed optical lenses with different uses, such as Baihua mirror, Yuan Yang Jing, magnifying glass, polygon mirror and magic mirror. Since then, the glasses made by Sun Qiu Yun have become world-famous. Unfortunately, such an accomplished technician died at the age of 33. However, he left a scientific and technological work called History of Mirrors, which played an immeasurable role in promoting the manufacturing technology of glasses in later generations.

After Sun, during the Qianlong and Jiaqing years of the Qing Dynasty, there was another person who made glasses in Suzhou, named Chu Sanshan. He further developed the technology of making glasses, which was quite influential.

Suzhou produced two outstanding technical talents who made glasses, Sun and Chu Sanshan, which promoted the formation and development of Suzhou glasses industry at that time. 1735, Suzhou has a manual workshop specializing in the production of glasses.

By the Kangxi period of the Qing Dynasty, the production and sales of glasses had flourished in Beijing, Shanghai, Suzhou, Tianjin, Guangzhou and other places. Glasses have become a special commodity.

2. The smooth development of the optical industry in the late Qing Dynasty and the early Republic of China.

1840 since the opium war, western optician technology was introduced to China, which opened up a new road for the rise of the optical industry. At the end of the Qing Dynasty, first of all, an Englishman, J. HnGoddard, opened the "Gaode Foreign Firm" in Shanghai, specializing in machine grinding optical glasses. Then other foreigners came. For example, Tobin started "Mingjing Foreign Firm" and "Remote Foreign Firm" run by British Jew Ram Tann.

Since then, in 19, Zhongmin raised funds to establish China Jingyi Glasses Company. Due to the opening of Le 'an Glasses Company, China's glasses industry has made new progress, especially in optometry.

① Began to abolish the long-term use of "Love winning numbers" optometry glasses in old stores and adopt the optometry technology combining subject and object.

Pet-name ruby eliminated the method of making lenses by pure manual operation, set up mechanical grinding equipment and developed grinding technology. At this time, we can not only grind out lenses with different specifications, but also start to supervise various frames (frames) ourselves.

(3) In terms of inspection, grinding, cutting, assembly, straightening and manufacturing, we have adopted some new technologies and equipment from abroad, trained a generation of professionals who make glasses, and laid a solid foundation for the rapid formation of a new technical team in China's glasses industry.

Because the glasses produced by Le 'an Glasses Company meet the needs of Chinese people, and the price is lower than that of foreign goods, it quickly occupied the Chinese market and opened branches in various places. By World War I, Lean Glasses had set up 18 branches in Beijing, Hong Kong, Tianjin, Jinan, Shenyang, Dalian, Harbin, Nanjing, Wuxi, Suzhou, Hangzhou, Yangzhou, Hankou, Changsha, Nanchang, Kaifeng, Guangzhou and Chongqing.

Before the Anti-Japanese War, the products of Lean Glasses Company won an award at the Panama World Expo. 19 19, Dr. Sun Yat-sen went to the branch of Guangzhou Lean Company for optometry and glasses, and wrote the inscription "Keep improving".

Around 1935, in addition to lean glasses company, several large professional glasses companies were established in Shanghai, including Maochang glasses company and Wu glasses company. These professional glasses are equipped with advanced optometry equipment and special machines for lens processing, polishing and trimming.

At the same time, the glasses industry in Beijing has also made great progress. Shenchang Watch and Glasses Store and Daming Eyepiece Company (founded in 1937) have been established in Beijing successively, and there are ophthalmoscopes and lens processing workshops in the front store and the back factory respectively. At the same time, the original old-fashioned production mode-cottage industry workshop has also been developed and increased, and its production skills have been constantly innovated, and some imported materials have been adopted to update old-fashioned glasses in form. Since then, the glasses industry in Beijing has flourished, and then the glasses trade union was established to coordinate the common problems of the whole industry. This is the general formation process of the old China Beijing glasses industry.

3. Changes and leaps in the optical industry after the founding of New China.

In old China, although the development of the glasses industry has begun to take shape, and there are industrial organizations such as industrial gangs or trade associations, in its production and circulation, it belongs to private shops and family workshops, and the products are mostly decorations serving the ruling class, with low output and high price, so the development speed slows down. Especially in the production industry. Until the eve of liberation, there were only a few manufacturers of glasses in China, all of which were one household, with a dozen workers and at least one or two people. Moreover, the production technology is very backward, the product quality is inferior, the variety is monotonous, and the system has been the same for decades.

After the founding of New China, under the guidance of the Party's correct line, glasses production started from small family workshops and developed into small enterprises organized for cooperative production. Before Beijing cooperation and public-private partnership, there were only a few optical industries and businesses.

There are nearly 100 small workshops in the industry with more than 270 employees; There are 39 full-time and part-time shops with less than 300 employees, of which only 10 (namely Lean, Daming, Dongfang, Smart, Changming, Siming, Baolong, Liu Mingzhai and Sun Changji).

There is a production workshop in front of the store, followed by a factory and a glasses processing workshop attached to Tongren Hospital, with a total of 46 production workers.

With the rapid development of China's economic construction, the glasses industry has also developed vigorously. In terms of industry, Beijing, Shanghai, Suzhou and other major producing areas have a certain scale of glasses production bases. For example, Shanghai No.1 Glasses Factory, Shanghai No.2 Glasses Factory, Beijing Glasses Factory, Beijing 608 Factory, Beijing 603 Factory and Suzhou Glasses Factory. , has become a large-scale backbone enterprise in China optical industry, with a scale of nearly 1,000 national medium-sized enterprises. The number, quality and supporting capacity of its production personnel rank first in China. Some products are municipal or national quality products, and some brand-name products have been exported for many years, enjoying a good reputation at home and abroad.

In addition, some enterprises in the national defense industry and some enterprises in the instrument industry have turned to the production and processing of glasses industry, and the commercial service departments have also continuously expanded or increased their sales outlets, adding L optometry equipment and instruments. Some cities also attach great importance to theoretical education, such as Beijing, Shanghai, Guangzhou, Tianjin and Chongqing. Short-term training courses on glasses technology and professional technical schools for workers have also been set up, which have trained a large number of professional and technical personnel for the glasses industry.

1985 In April, the inaugural meeting of "China Glasses Association" initiated and led by the Ministry of Light Industry was held in Zhenjiang City, Jiangsu Province. Attending the meeting were the in-laws of collective member enterprises 140, including 85 large-scale backbone enterprises, belonging to the Ministry of Light Industry, the Ministry of Commerce, the Ministry of Machinery Industry, the Ministry of Weapons Industry, the Ministry of Agriculture, Animal Husbandry and Fisheries, the Ministry of Health and the State Science and Technology Commission. In 14 provinces, municipalities, autonomous regions and other 3 1 cities; There are 27,237 employees. Among them, there are 1,393 technicians: 65,438+05 in units with more than 500 employees, 29 in units with 200-500 employees and 465,438+0 in units with less than 200 employees. According to the economic nature, there are 0/5 enterprises owned by the whole people, 49 collective enterprises, 0/0 township enterprises and several Sino-foreign joint ventures. The total net value of these 85 fixed assets is145.22 million yuan, and the production capacity of 1984 is: 20180,000 sub-frames, including 5.9 million metal frames. Lenses16.09 million pairs, blanks16.94 million pairs; The total output value is 65.438+0.4 billion yuan, the total sales amount is 65.438+0.9 billion yuan, and the total profit is 34.49 million yuan. We export 6.5438+0.5 million pairs of spectacle frames and lenses every year, earning 750,000 US dollars. Nearly 100 factories and businesses have applied to join the glasses association since it was established more than a year ago. By the end of 1986, it had grown to 240 collective member enterprises with more than 30,000 employees.

The development of China glasses industry has experienced thousands of years of development and changes. Up to now, it has formed a large industry with a certain scale and supporting production capacity, which has become an indispensable part of the whole national economy and made due contributions to the country and the people.

Types of glasses

monocle

The oldest glasses in China are round monocles made of crystal or transparent minerals.

In the Ming Dynasty, western glasses were introduced to China through the Western Regions or Nanyang. After receiving glasses from friends, Wu Kuan wrote a poem to thank him. The description in the poem is "the circle is the same as the English pod, and the net is mica", and the usage is "holding it by the eye socket". Monolens is also called "single photo". "Since then, single lighting has existed. This ancient legend is a western heritage." (Suzhou official record)

Photo gray glasses

Many car drivers often wear a pair of black glasses when driving. This pair of black glasses can protect your eyes from the long-term stimulation of strong light when driving in the sun or snow. However, when the car suddenly drives from bright to dark, wearing black glasses becomes a burden. It's really inconvenient to wear it for a while and take it for a while. Is there any good way to relieve the driver's distress? Yes Wear color-changing glasses. In the sun, it is a pair of black sunglasses, and thick black glass lenses block the dazzling light. In a room with soft light, it becomes as transparent and colorless as ordinary glass.

The secret of color-changing glasses is in the glass. This special glass is called photochromic glass. In the manufacturing process, photosensitive substances such as silver chloride, Australian silver halide and a small amount of copper oxide catalyst are pre-doped. Glasses from colorless to light gray, dark brown, and then from black glasses back to audio-visual glasses, are the magic of silver halide. "In the glass of color-changing glasses, there is a change process that is very similar to the exposure imaging of photosensitive film. Silver halide is decomposed into many black silver particles by light, which are evenly distributed in the glass, so the glass lens appears dim and blocks the passage of light. These are black glasses. However, unlike the photo film, the silver atoms and halogen atoms produced by the decomposition of silver halide are still closely combined. When we return to a slightly dark place, with the promotion of copper oxide catalyst, silver and halogen recombine to form silver halide, and the glass lens becomes transparent again.

Silver halide is resident in glass, and the reaction of decomposition and combination goes on endlessly. Photographic film and paper can only be used once, but color-changing glasses can always be used. Color-changing glasses can not only darken and brighten with the light intensity, but also absorb ultraviolet rays harmful to human eyes, which is really the top grade in glasses. If all the windows are replaced with light-colored glass, the sun will not shine in the room on a sunny day; On cloudy days or in the morning and evening, the outdoor light is not blocked and the room is still bright. It's like hanging an automatic sunshade on the window. In some high-end hotels and restaurants, color-changing glass has been installed. This photochromic glass is installed in the cab of the car and the window of the tour bus. You don't even need to wear color-changing glasses in direct sunlight. Always keep soft light in the car to avoid glare and exposure of the sun. How happy everyone should be!

Contact lenses/contact lenses

Contact lenses, as the name implies, are "invisible". It not only has the function of correcting vision with ordinary glasses, but also relieves the inconvenience caused by frame glasses, so wearing contact lenses has become a fashion at present. However, contact lenses are not suitable for everyone who needs glasses. Who should not wear contact lenses?

Primary and secondary school students are in a period of vigorous growth and development, and the visual axis of the eyeball has not yet been finalized. If they wear contact lenses prematurely or continuously for a long time, it is easy to produce side effects such as corneal hypoxia and physiological and metabolic disorders. If the lens is not strictly cleaned and disinfected, it will cause secondary infection; If the lens labyrinth does not adapt to the cornea, it will also cause corneal abrasion and epithelial shedding, and in severe cases, it will lead to corneal ulcer or perforation. Therefore, if primary and secondary school students have no special needs, it is better to wear frame glasses.

Cold patients often carry a lot of germs on their hands, which can easily enter their eyes when taking or wearing contact lenses. In addition, colds are often accompanied by mild retinal inflammation, and wearing contact lenses will aggravate the inflammation. Many colds, coughs and painkillers contain ingredients to suppress tears. Reduced tear secretion will make contact lenses too dry, reduce transparency and affect vision.

The complications easily caused by people with allergic constitution wearing contact lenses are mild inflammation, itchy eyes, redness, conjunctivitis and eye swelling. If these diseases are not treated for a long time, they may endanger vision. If allergic people must wear contact lenses, it is best to use them only during the day and stop using them at least once a week. If there is inflammation, it is best to stop using it. If the inflammation is still not relieved after 2 to 3 days, you should go to the hospital immediately.

If patients with glaucoma, chronic dacryocystitis, conjunctivitis, corneal ulcer, hyperthyroidism and other diseases have been equipped with contact lenses, and their eyes are in the inflammatory stage, they should not be worn until the inflammation disappears.

When a fever patient has a fever, the local resistance of the eyes decreases and the secretion of tears decreases. Bacillus subtilis will multiply in large numbers, and the metabolites of bacteria will be deposited between the cornea and the lens, which will reduce the oxygen permeability of contact lenses and interfere with the normal metabolism of the cornea, thus causing bacterial corneal ulcer.

When cycling tourists ride for a long time, the air convection accelerates, which reduces the moisture of soft contact lenses, and the lenses gradually dry and harden, and the eyes will feel uncomfortable. Over time, hardened lenses can damage the cornea, leading to eye pain or bacterial infection.

After the middle-aged and elderly people reach the age of 40, the eye tissue will obviously degenerate. The local resistance of eyes decreased, especially the ability of eyeball to tolerate hypoxia decreased. At this time, if you wear a thin lens on the surface of the eyeball, it will lead to hypoxia of the eyeball, which is prone to complications such as corneal infection and ulcer. Middle-aged people aged 40 to 60 can wear contact lenses for a short time, and it is best not to wear contact lenses for the elderly over 60, otherwise it will easily lead to serious complications and permanent vision damage.

Pregnant women are not suitable for wearing contact lenses. During pregnancy, because the secretion function in the human body has changed, the barrier function of corneal tissue has decreased, the secretion of tears has decreased, and it is uncomfortable to wear, so it is best not to wear it.

Crystal glasses

Crystal glasses are expensive, which makes people feel very cool after wearing them. Some people think they have a nourishing purpose. There is no scientific basis for this. Crystal was first used to make glasses because optical glass could not be made at that time, and there was no better optical material than crystal. It has been proved by scientific practice that when light passes through the crystal, it will be birefringent and overlap. Moreover, the effect of crystal blocking ultraviolet rays and infrared rays is not very good, and most of them can pass through. Crystal glasses are expensive because the crystal geology is hard and brittle, which is not suitable for annihilation, and the output of pure crystal is not because it has special maintenance function for eyes. People feel cool when wearing crystal glasses because crystal lenses absorb less ultraviolet and infrared rays, but the temperature is low, but they can't afford to keep their eyes.

Ski glasses

Ski goggles are divided into alpine mirrors, platform mirrors, cross-country mirrors and self-bending mirrors. Because of the strong sunlight reflection in the snow, the cold wind is very irritating to the eyes during skiing, so ski goggles are needed to protect the eyes of skiers.

Ski goggles should have the following functions: first, prevent cold air from irritating the eyes; Second, prevent ultraviolet rays from burning eyes; Third, the mirror can't fog; Fourth, don't hurt your face after the ski goggles fall.

According to the above requirements, you should try to choose a fully enclosed ski goggles, which looks like a diving mirror, but does not buckle your nose. The outer frame is made of soft plastic, which can cling to the face and prevent air from entering. The mirror surface is made of colored material coated with anti-fog ultraviolet coating. This kind of material is very soft, it will not break and distort, so as to ensure that the mirror will not be damaged when it is hit. In addition, the upper edge of the outer frame is provided with air holes made of air-permeable sponge, which can radiate the hot air discharged from the facial skin to the outside of the mirror to ensure that the mirror has a good visual effect.

Criminal positioning glasses

The right side of the criminal positioning glasses is equipped with a high-performance sound receiver, which can be eavesdropped by stimulating the eardrum with special sound waves installed on the left side. Signals can be received within a radius of 20 kilometers from the location of the tag transmitter, and the signals are displayed on the night screen on the left side of the glasses. But it has to be recharged, which makes it difficult.

Self-adjusting myopia glasses

According to the optical principle, self-adjusting myopia glasses can consciously perceive the change of lens curvature, and adjust the diopter of new soft lenses accordingly, so that a pair of glasses can be used for a long time without replacement, saving trouble and money, realizing optical application, which is a major revolution in the history of glasses.

Reflective glasses with rear view

A special kind of glasses. Looking at the front is no different from ordinary glasses. After wearing them, you can clearly see the situation behind you through the outside of the lens, which is convenient for detectives to check back and forth and prevent being followed. As far as tracking and monitoring is concerned, it can work behind the monitored object, or in front of or on the side of the monitored object, with good concealment effect.

The Connotation of Glasses Culture

Glasses culture fully reflects the cultural characteristics of a country and a nation, such as ideology, morality, values, beliefs, customs and habits, and develops with the development of culture in various historical periods. It is a combination of materials and art, and it is embodied in a tangible way. On the one hand, it reflects the progress of social civilization, but also reflects the identity, social status, ideas, hobbies and so on of the wearer.

1, lens culture

The cultural connotation of the lens is mainly reflected in the excellent material, the size, curve, combination and color of the lens. In ancient times, the glasses used by emperors, bureaucrats, rich people and ordinary people were different, reflecting completely different cultural colors and connotations. In modern times, men and women from all walks of life, such as industry, agriculture, commerce, learning and military, use different styles of mirrors, which all reflect people's ideological and cultural connotations.

2. Framework culture

The picture frame culture is also reflected in the material, the exquisite appearance, color and decoration of the picture frame, and the implication of the picture and text. In ancient times, the picture frames were often engraved with patterns such as blessing, auspiciousness, longevity and wealth, which reflected the value connotation of "happiness is in sight", "both happiness and longevity", "official prosperity" and "making money in four seasons". At the same time, the shop name, font size, name and gold content are often engraved on the beam frame. According to different social status and status, emperors and dignitaries used precious materials such as gold, silver, tortoiseshell and ivory, while ordinary people used materials such as copper, iron, steel and wood to make glasses. The beam shape of glasses has gradually changed from the initial arch bridge shape, door opening shape, door opening shape and arc shape to a straight line, bamboo joint shape, upper and lower beam shape and so on. Liang cards and side cards range from moire, cat's head and tiger's head to eagle's head, two-point and plum blossom.

Modern picture frames are further developed on the basis of ancient picture frame culture, and are more colorful in form, design, decoration, pattern and color, reflecting new values and aesthetics.

Common sense of buying glasses

Precautions for glasses

1 First of all, you should choose a regular and reputable optical shop for glasses, and the quality and service of glasses are guaranteed.

2, before glasses, should first optometry, not blindly buy.

3. After the glasses are made or purchased, the optician will make glasses according to the face. Generally speaking, if the parameters are appropriate, you will feel very clear when you put on new glasses.

If you find any quality problems with the products, you should contact the store in time.

Choose glasses lenses

Glasses lenses can be divided into two categories, namely glass lenses and optical resin lenses.

Glass lenses include optical glass lenses and high refractive index lenses (commonly known as ultra-thin lenses), which have high hardness and good wear resistance. Generally, their quality and various parameters will not change with time, but the impact resistance and weight of glass lenses are slightly lower than that of resin lenses.

Resin lenses are generally much lighter than glass lenses and have better impact resistance than glass sheets, but their surface hardness is low and they are easy to be scratched. Because of its soft characteristics, resin lenses and coated lenses should be careful not to let the mirrors directly contact hard objects. When scrubbing, it is best to wash with clear water (or mixed with a small amount of detergent) first, and then use a special test cloth or high-quality cotton paper to absorb the water droplets on the glasses. In addition, coated lenses should be used with caution in places with poor environmental conditions to avoid being contaminated and difficult to clean.

Select glasses frame

When choosing a spectacle frame, besides the price and beauty, we should also pay special attention to the size of the selected spectacle frame to match my pupil distance as much as possible, because it directly affects the inherent optical quality and wearing comfort of glasses.

The identification of frame quality can mainly consider the following items:

1, frames with good elasticity are generally of better quality.

2. Glasses with smooth and glossy coating have better quality.

3. Glass with smooth, fine and uniform solder joints has better quality.

4. It is best to assemble the parts closely.

5, the size and shape of the left and right mirror rings must be exactly the same, and the bridge of the nose is symmetrical.