Which is better aspherical lenses 1 56 1 61 1 67?

The best, now the biggest is. Rest assured, ask my doctor dad. Added:

And the lens ** is very different, some 60, some 200, what do you need to pay attention to? Am I worried about damaging my eyes, or do I just need to feel clear and comfortable? ：

No, just pay attention to this refractive index.

Don't worry, this is a very high-grade lens on the market, **You can kill hard, the water in this is very deep. Follow-up question: Yes, I used to have a spherical mirror and a frame in the town for 200 yuan a payment, and the online frame lenses add up to only 100, and the lenses he gave me are quite thick, and they feel much thicker than those on the Internet, and they cost 120 a payment, which is depressing!

Want to buy aspherical lenses online.

May I? I haven't tried it before, I'm 700 and 750 for sure : yes, but be careful not to be deceived.

If you buy lenses, you look at the refractive index of the lenses, by the way, do you know what aspheric surfaces look like? Its mirror surface is flat, without a bit of curvature. Added:

The refractive index is the number you start asking about: If you buy it online, how do you determine the refractive index of a lens? Is it just to look at the packaging?

Are there any other ways to sign a contract? And how to determine the quality of good or bad, because everything is good or bad, how to pick the better one? ：

Merchants will always provide some lens data, right?

For 450-degree myopia and aspherical lenses, it is better to choose.

Aspherical lenses, refers to aspherical lenses with refractive index.

Lens refractive index, the lens slips to the superscript74 refers to the refractive index of the lens, for myopia.

For glasses, the higher the refractive index of the lens, the thinner the edge thickness of the lens, all other parameters being the same.

However, the refractive index of the lens is not the higher the better, in general, the higher the refractive index of the lens, the Abbe number.

The lower it is, the more dispersion.

The more obvious. With the upgrading of lens material technology, this law is gradually being broken, such as refractive index lenses, which have a refractive index higher than67, but the Abbe number is higher than that of refractive index lenses and most refractive index lenses.

Material Classification:

Common lenses on the market are roughly divided into glass sheets, resin sheets, PC lenses, etc. according to the material.

Among them, glass has a strong ability to refract light, so the refractive index of glass lenses can also be achieved90。However, due to the fragile nature of glass lenses and the heavy material, they are generally only used for ultra-high myopiaGlass lenses are only selected for 90 refractive index lenses.

Due to impact resistance.

Strong, unfragile, and good light refraction ability, plastic lenses have attracted more and more attention and have now become the mainstream of the market.

With the development of the glasses market, consumers' awareness of plastic lenses continues to improve, and at the same time, higher requirements are put forward for the performance and function of products, which makes the sales of low refractive index lenses gradually decline, and lenses with high refractive index and excellent performance have attracted much attention from consumers.

In the past few years, there are very few manufacturers in the domestic market that independently develop and research high refractive index lenses, and high refractive index products are almost all imported, which is not only the most expensive, but also its quality and performance can not meet the requirements of consumer fuel concessions.

In recent years, some domestic manufacturers have built their own lens raw material factories, intervened in the research and development of lens raw materials, and independently developed a series of high refractive index lenses, including daily universal lenses, ultra-bright lenses, and anti-blue light lenses.

Smart self-tinting lenses.

Multi-effect protective lenses and progressive multi-focal lenses to meet the diversified needs of consumers.

This refers to the refractive index of the lens, the higher the refractive index, the thinner the thickness of the lens, that is, the thinner.

Plastic lenses are the only ones that have a refractive index of a plastic lens, and the higher the refractive index, the thinner and more beautiful the lens is. The common glasses lenses on the market are roughly divided into glass sheets, resin films, and cosmic films (commonly known as: PC films, space films) according to the material.

Usually the refractive index of the lens is marked, and the higher the refractive index, the thinner the lens with the same luminosity.

Plastic lenses are becoming more and more popular, and due to their impact resistance and fragility, lenses can be made thinner and can be paired with rimless and half-rim frames without any problems. On the other hand, the strengths are also the weaknesses.

It is not easy to break because of its low hardness, so the surface of the lens is not good enough to wear and can be easily scratched. Although it can be hardened and filmed, it still needs to be carefully protected to maintain a long life. Therefore, high-fold lenses, lenses are also a good choice for patients with high myopia.

Since there are only one or two manufacturers of high-fold glass lenses in China, the lenses need to be customized according to the power of consumers.

Follow the method to choose the right glasses for you:

Choose the right shape: The shape of your face determines the shape of the frames, so take a closer look at your face to see where it is higher and where it is flatter. When choosing a frame, you should do the opposite according to the condition of your face. For example, people with a very round face are not suitable for wearing round glasses.

For people with long faces, it is suitable to choose wide-brimmed, dark-colored, large-framed glasses, due to the formation of a strong horizontal cut, the straightness of the long face is broken, and the face shape will appear fragmented visually. Glasses with no bottom edges, transparent, thin-framed, and gold-rimmed frames are not suitable for people with long faces.

For people with short faces, the color of the frame should be close to the face face, and the color contrast is easy to form the feeling that the face is cut, which makes the face shorter. The absence of a rim frame makes it easy to visually match skin tones and does not make the lower half of the face appear shorter. Choose thin-rimmed glasses and clear, gold, and silver-rimmed glasses that are easy to balance and harmonize with the shape of the face, and don't wear large-framed glasses to avoid glasses taking up too much space on the face.

People with round faces, should avoid large frames, dark frames, and wide-brimmed frames. It is also not suitable for wearing round or square frames. Because the round frame will cause too many round lines on the face on a round face, the square frame will contrast with the rounded face line, making the face more rounded.

The color of the frame: The color of the frame is relatively casual, and it does not necessarily have to match other clothing and accessories. The key is that it will add color to your eyes and face.

You can choose a color that matches your natural skin tone, or a color that matches the color of your hair or eyes, depending on which part you want to emphasize.

The difference in the refractive index of the lens, the refractive index is equivalent to the luminosity of the eye from high to low. Example: The refractive index is higher than above;

2.Difference between thickness and thickness of lenses**: The higher the refractive index, the lighter and thinner the lens. Therefore, the ratio of lenses is higher;

3.Difference of Abbe number: The Abbe number is relatively low. The higher the refractive index of the lens, the lower the Abbe number and the more pronounced the dispersion. The higher the refractive index of the material, the lower the Abbe number.

Question: What kind of 300-degree is suitable?

is the refractive index of spectacle lenses, high refractive index, thin spectacle lenses. The refractive index of common lenses is74。

Aspherical glasses, good corrected vision, *** vision, comfortable and long-lasting eyes to see things. Aspherical glasses are glasses that are formulated based on the actual refractive power of the corneaTherefore, the corrected visual acuity is good and the visual quality is high, because the refractive power of each meridian of the normal cornea is not the same, and the use of spherical glasses makes the eyes see things as clearly as aspherical glasses, and the cost is more than 1,000 yuan. First go to the eye examination to confirm the diagnosis, and decide according to the actual situation.

Definitions

An aspheric mirror is a lens whose surface is not spherical or cylindrical. In photography, lenses that contain aspherical optical elements.

The surface curvature of aspherical lens is different from that of ordinary spherical lens, and in order to pursue the thinness of the lens, it is necessary to change the curved surface of the lens. The aspherical design now corrects the image, solves problems such as distorted vision, and at the same time, makes the lens lighter, thinner, and flatter. Moreover, it still retains excellent impact resistance, making it safe for wearers to use.

[Lens features].

In the era of continuous technological advancement, the aspherical design is an optical miracle that reduces the aberrations of the edge of the lens to the bottom, so that it can meet the needs of customers with a wide field of vision. Aspherical lenses have a flatter base curve and are lighter in weight, giving them a more natural and aesthetically pleasing look. In the case of high diopters, it can reduce the distortion of the eyes, and for consumers with high visual power, aspherical lenses may be more suitable.

The surface curvature of aspherical lenses is aspherical design, and the advantages of this design over spherical lenses are:

Clearer

The aspherical lens with a unique coating treatment has a perfect visual performance, presenting a clearer and more comfortable visual effect.

Easier

Almost unnoticeable when you wear aspherical lenses, you can enjoy the ease it gives to your eyes**.

It's more natural to be friends

The aspherical design is more natural, with less visual distortion and more realistic vision.

1. Glasses in myopia.

Neutral, sum refers to the refractive index of spectacle lenses.

The higher the preceding number, the higher the emissibility. Hail.

2. The higher the refractive index of the lens, the lower the thickness of the lens, and the thinner the lens is than the thickness.

3. In terms of comfort, the two are about the same, but they can save a lot of money and are much more cost-effective.

4. There are also subtle differences in the clarity of these two lenses, and the Yuanxian Xing lenses are slightly worse in terms of clarity, and it is not very obvious.

5. The summary is as follows.

Aspherical lensesThis means that the surface of the lens is relatively flat, with no central bulge like a spherical mirror. Non-spherical dry lenses are also more realistic to the visual aspect, and are not easy to deform and distort. At present, spherical lenses are outdated, and the market is basically replaced by aspherical surfaces.

However, some people who have been wearing spherical lenses before will feel that they have become smaller when they switch to aspherical lenses.

You can first check whether the wheelbase degree is the interpupillary distance.

Whether the left and right up and down are accurate. All of a problem, each time you get a new pair of glasses and lenses, it can take a few days to get used to, depending on the sensitivity of each person's eyes.

Advantages and disadvantages of aspherical lenses

Clearer: The aspherical lens with a unique key hole coating has a perfect visual performance, presenting a clearer and more comfortable visual effect.

Easier: Aspherical lenses are barely noticeable when you wear them, they are your eyes** and you can enjoy the ease it brings you.

More natural: The aspherical design is more natural, with less visual distortion and more realistic vision.

The lens ratio is thicker.

Difference 1, the thickness is different.

In the case of the same thickness of the lens center, the lens with the same power and the same material has a thinner edge with a higher refractive index than a lens with a lower refractive index. The higher the number, the thinner the lens. The lenses are thinner than the lenses.

2. The refractive index is different.

and represents the optical refractive index of the lens. The lens is a medium refractive index lens, which has both a spherical and non-spherical design, and the lens is a high refractive index lens, and only an aspherical design. Aspherical lenses can reduce the edge phase contrast of the lenses, resulting in a clearer and more natural field of vision.

The difference is not big, and the different chamfering techniques will indeed affect the final thickness.

Purpose and benefits of aspherical glasses

Folding Purpose:

In order to reduce the aberration of optically corrected lenses and make the lenses flatter, reduce the lens magnification to obtain clearer, thinner, and lighter quality lenses.

Folding advantages:

1) Optical advantages: reduce the aberration of the lens, and see the object more clearly;

2) Clear images can also be obtained at high gloss: Spherical point focus lenses, although the best base arc design, are +700d

The luminosity other than 2200d is not within the range of the Cherning ellipse, and the aberration cannot be eliminated, and the better image quality can only be obtained by using aspherical design.

3) The flatter, thinner and more beautiful lenses can be made The higher the lensity of the spherical lens, the worse the appearance, the aspherical lens can choose a flatter design with a flatter base arc, which not only makes the appearance beautiful, but also reduces the peripheral magnification so that others can look at the eyes of the wearer, and the size will not change much.