Question 2: What materials are there for myopia lenses? What kind of lens is the best? Since the invention of 13 century lens, lens has been polished with crystal glass. In China, besides crystals, artificial crystals are also used. Later, glass lenses were used. 1937, France invented a plastic spectacle lens called acrylic. Although it is not easy to break, the clarity is poor. 1954, an engineer of Essilor 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 has been used ever since.
Question 3: What kind of glasses lens resin is good! It is better to add a film!
At present, the lenses on the market are mainly optical glass lenses and resin optical lenses, and gradually transition from glass lenses to resin lenses, and from not adding films to adding films. The development trend of lenses is: ultra-thin, ultra-light, ultra-wear-resistant, ultra-flat, ultra-transparent, ultra-strong, ultra-resistant to ultraviolet and electromagnetic radiation.
Optical glass lenses have strong corrosion resistance to water, acid, alkali solution, polishing agent and other chemicals during processing or use, high hardness and good thermal stability, and are not easy to scratch and deform. The transmittance of colorless optical glass sheet to visible light can reach above 92%.
1, light white flat: high light transmittance, clear and bright vision, low price, suitable for students and people who work at their desks indoors for a long time. Due to the limitation of refractive index, when the degree exceeds 5.00D, the lens is thicker.
2.x-ray film: The most striking feature is the bicolor effect, that is, it is light purple in incandescent lamp and light cyan in fluorescent lamp, which makes things softer.
3, Kesai tablets: the lens is light pink, with strong aesthetic feeling and softer vision.
4. Color-changing film: the color becomes darker under ultraviolet (outdoor) irradiation. Usually the colors that change color are dark brown, gray and tawny. After avoiding ultraviolet rays, the color gradually returned to the level before discoloration. For people who travel to work or often work outdoors, it is ideal to match the color-changing film.
5. Ultra-thin lens: Due to the improvement of the refractive index of the lens, for high myopia, the edge thickness of the lens is thinner than that of the ordinary refractive index lens, and the appearance is more beautiful, which expands the range of selecting frames. Therefore, patients with high myopia are better equipped with ultra-thin lenses.
6. Coated lens: Coated lens is a multi-layer film coated on the above-mentioned optical lens, which is used to enhance the transmittance, better prevent ultraviolet rays and make the vision clear and bright. It is still a high-end lens.
7. Double-lens: This kind of lens is made into a pair of glasses with hyperopia and myopia lenses, which solves the trouble of changing glasses frequently, and is especially suitable for the correction of presbyopia, which greatly facilitates the elderly optician.
Question 4: What material is better for myopia lenses? At present, resin is the most commonly used material for glasses. This material is light in weight, good in toughness, stable in chemical properties and easy to manufacture, and has become the mainstream lens raw material in the market.
Of course, the resin lens has been gradually upgraded, such as the PC lens of Essilor, which has better hardness!
Question 5: What kind of lens should be used for myopia glasses? The material of the frame is better. 1. How to choose/prepare a pair of suitable glasses?
First of all, you should go to a regular and reputable optical shop (such as Optics Valley Ethan Glasses) to find an experienced optometrist and tell him the purpose of glasses, such as whether they are used far or near.
When you get an optometry prescription, you can choose the appropriate spectacle frame and spectacle lens according to your face, parameters and price. Optical shops will manufacture glasses according to the parameters and requirements of optometry prescriptions, and the indexes of finished glasses should meet the requirements of national standards.
After the glasses are made, the proofreader will make appropriate adjustments according to the characteristics of the face, so that the glasses are comfortable to wear and elegant. Generally speaking, if the parameters are appropriate, you will feel very clear when you put on new glasses.
Second, how to choose a spectacle frame
When choosing a spectacle frame, besides price and beauty, special attention should be paid to the size of the selected spectacle frame to match the pupil distance as much as possible, because this choice 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. Parts should be assembled tightly.
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.
Third, how to choose glasses lenses
Generally speaking, 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 (so-called 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.
Fourth, how should consumers protect themselves?
The quality problems of glasses encountered by consumers are as follows: first, the vertex power (commonly known as diopter) is inaccurate, that is, the vertex power of glasses is inconsistent with the diopter that the wearer needs to correct; Second, the pupil distance is not accurate, that is, the horizontal distance of the optical center of the glasses does not match the pupil distance of the wearer; Third, the axis deviation of cylindrical lens does not meet the product standard. These inconsistencies directly affect the correction effect, causing the wearer's visual fatigue, which will aggravate the visual decline, and even cause headache, dizziness and nausea in severe cases.
Consumers should optometry before fitting glasses, and don't buy them blindly. Try to optometry in large and medium-sized professional optical shops. When matching glasses, you should ask the store for the processing list of glasses and know the basic parameters of your glasses. If you find quality problems, you should contact the store in time and get a proper solution.
Question 6: What kind of lens is good? There is no difference between good and bad materials, and each has its own uses, advantages and disadvantages.
Choosing a lens depends on your level, purpose and requirements.
Now the general lenses are resin lenses.
Lighter, the height of the edge will be thicker, and the lens will be soft and easy to scratch.
PC lens has high toughness. Generally, this kind of lens is selected on rimless frames and sports glasses, which are lighter, thicker in edge, softer and easier to spend.
Glass lens, with high hardness, not easy to scratch, fragile and thin edge, is mostly used for people with high height.
There are also three kinds of lenses with different materials and different functions.
Please also go to the local optical shop to learn more about it.
Question 7: What material is good for polarizer? Polarizing lenses are generally divided into: resin polarizers.
Glass polarizer
The resin polarize has that advantages that:
1. Light weight.
2. Not fragile: the lens is broken, not only with few fragments, but also not too sharp, which can minimize the damage to the eyeball and face. This is also the main reason why it is advertised as a "safety lens" in the market.
3. dyeable: resin lenses are easy to dye and can be properly matched with clothing and fashion.
4. It can block ultraviolet rays: it can almost completely block ultraviolet rays with a wavelength below 350mm, and the effect is far better than that of glass lenses.
5. Strong anti-fogging: Because the thermal conductivity of resin lens is lower than that of glass, it is not easy to be blurred by steam and hot water, even if it is blurred, it will soon fade.
6. Anti-dent: Generally, substances with high heat and small volume are easy to cause dents and spots on the glass sheet, but they will automatically bounce off when touching the resin lens, and will not cause any traces on the lens surface.
7. The surface reflection of resin lens is lower than that of ordinary glass sheet, so it is less dazzling.
8. Resin bifocal lenses have no chromatic aberration. This is because resin bifocal lenses are integrally formed, so the chromatic aberration of fused glass bifocal lenses is very small.
9. Resin lenses can resist a variety of chemicals and solvents, and almost all household solvents and chemicals will not affect or damage them.
Disadvantages are:
1. easy to scratch: the scratch resistance of resin lens is worse than that of glass lens, but it can be improved by surface hardening treatment, but the effect is limited.
2. It is easy to deform when taking a view: this is because the density of plastic lenses is lower than that of glass lenses.
3. Not resistant to high temperature: Although the resin is a thermosetting material, once the multilayer film is plated, the surface of the multilayer film may crack due to high temperature.
Glass polarizer has the following advantages:
1, high hardness: the surface is not easy to scratch, and it is more wear-resistant than resin sheet.
2, high density: the film will not be deformed due to improper film loading, thus affecting its polarizing effect. Resin sheets are less dense and more willful than glass sheets. If the sheet is improperly installed or the shape of the glasses itself is not very consistent, it will be deformed and affect the polarization effect. How to determine whether the lens is deformed is in my "Several Tips for Choosing the Sun".
3. Strong light transmission: The light transmission of glass sheets is generally stronger than that of resin sheets, and the clarity is stronger.
Disadvantages are:
1, weight: Because its density is much higher than that of resin, ordinary glass will be heavier than resin glass.
2. Fragile: As we all know, glass is fragile. So its hard hitting ability is poor.
3. Expensive: The polishing process of Polaroid glass requires high requirements and the manufacturing process is troublesome, so ordinary glass polarizers are used for middle and high-grade glass.
Question 8: What is the material of the glasses frame?
The spectacle frame is made of the following materials
Tungsten-carbon material: Tungsten-carbon glasses are a new type of high-quality glasses frame, made of tungsten-carbon. Tungsten-carbon has the advantages of super toughness, high temperature resistance, non-allergy, and high antistatic property. Therefore, the spectacle frame made of tungsten carbon is more durable and more comfortable and healthy to wear.
Pure titanium material: Pure titanium spectacle frame is a kind of high-grade spectacle frame integrating fashion and quality. Strong texture, rich connotation, high strength, light weight, anti-allergy, super flexibility and so on. It is a boutique in the spectacle frame.
Tr90 material: tr90 spectacle frame is the most impact-resistant spectacle frame, and it is light in weight, not easy to deform, with super strength and super comfort, and it is the best choice for sports enthusiasts to wear.
Magnesium-aluminum alloy material: Magnesium-aluminum alloy spectacle frame is a relatively high-grade product in spectacle frame, made of high-grade magnesium-aluminum alloy. It has ultra-high hardness and light texture, good affinity with skin, and will not cause allergies. Deeply favored by high-quality people.
Alloy material: alloy glasses frames have the strongest texture among all glasses frames. Strong sense of integrity, high hardness, bright colors, full of fashion flavor, deeply loved by fashion people.
Plate: the spectacle frame made of plate can be described as the enduring glasses in the spectacle frame. Not easy to fade, not easy to deform, durable, rich in color and changeable in style. It is a combination of fashion and retro, and it is a necessary fashion item for young men and women to show their individuality.
After reading so many glasses frames made of materials, some people may ask which material is good. Here, Yichao glasses remind everyone that each kind of glasses frame has its own unique characteristics. Only by fully understanding the characteristics of each kind of spectacle frame can we choose the one that suits us.
Question 9: What material is good for the spectacle frame? At present, the materials of spectacle frames on the market are generally: plate, titanium, TR90, aluminum-magnesium alloy, carbon fiber, ULTEM, natural wood or bamboo.
In modeling, the plate is superior to any material, which is incomparable to the metal spectacle frame. With the launch of TR90 and ULTEM, the modeling effect of the plate has been achieved to some extent, but it is lighter than the plate, reducing the oppressive feeling of the nose.
In terms of price, plate, ULTEM and ordinary metal materials are relatively cheap, while titanium wood and bamboo wood materials are more expensive, and the price of pure hand-made will be much higher;
In terms of weight, ULTEM, one of beta titanium and titanium, is superior to other materials, and it is easy to wear and generally has a small nose print.
To sum up, ULTEM will be more outstanding in cost performance, a new material, which was first applied to ntent.