How thick is a 400 degree aspherical lens

The aspheric surface of your power is about 1 millimeter thinner than the aspheric surface, and the difference is less than one millimeter after machining. The interpupillary distance between your eyes.

It's 63, starting from the center of the nose bridge of the frame, moving millimeters to each side is the optical center point of your lens, which is the thinnest point. However, this position is on the medial side of the lens, which is the thinnest at the center point of the optics and thickens the outward it goes. After processing, the edge of the lens near the nose is close to the center point of the optics, so it is relatively thin, and the edge of the outer lens is farther away from the center point of the optics, so it is thick.

Some people have a large interpupillary distance and a relatively small frame, which may be about the same thickness on both sides after processing, or even thinner on the outside than on the inside. Your interpupillary distance is not too large, and it is relatively normal. Aspherical, from the top of the side lens, is almost flat, and if the power is low, it is still a little curvature, which is significantly smaller than the spherical lens.

Generally, it is necessary to know whether it is an aspheric surface through comparison before processing, because the aspheric surface is also about the same arc. After processing, it is necessary to take into account the same frame size and the same optical center point position. The optical center point is on the vertical line of your interpupillary distance.

So I can't be sure if your lenses are aspherical, thick on one side and thin on the other, which is normal.

The thickness of the 400-degree aspherical lens depends on the refractive index. The lens thickness is different depending on the refractive index.

The lenses are relatively thinner than the lenses.

However, the thinner the lens, the higher the natural cost, but relatively speaking, it will definitely be easier to wear, in short, there are pros and cons, and you can choose according to your own situation.

In addition to the correction of eye myopia, attention should also be paid to correcting daily bad eye habits, as well as oral eye vision nutrients to supplement the comprehensive nutrition of the eyes, so as to fundamentally control or improve the myopia of the eyes.

Generally, 400-degree ultra-thin lenses are about that thick.

Generally speaking, they are lenses, which are actually the thinnest lenses, but the lenses are really high, and the ratio is only a little thinner, and the cost performance is not highlighted. Therefore, most people on the market say that it is the thinnest plastic lens. Lenses with a refractive index are high-grade lenses with a thickness of .

But now it is necessary to judge according to the refractive index of the lens, the refractive index of the lens is some, some, some, the higher the refractive index, the thinner the lens, and the thickness of the processed lens, but also according to the size of the frame you choose, the smaller the frame, the thinner the lens.

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 achieved. However, due to the fragility of glass lenses and the heavy material, glass lenses are generally only used when refractive index lenses are needed for ultra-high myopia.

Due to the advantages of strong impact resistance, unbreakability, and good light refraction ability, plastic lenses have attracted more and more attention and have 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 expensive, but also its quality and performance can not meet the requirements of consumers.

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, anti-blue light lenses, intelligent self-color-changing lenses, multi-effect protective lenses, and progressive multifocal lenses to meet the diversified needs of consumers.

I specially found a lens and took it out to take a look, the thickness of different parts is different, the middle is 3mm, and the side is about 8mm.

Flying aspheric lenses are usually used for myopia within 500 degrees.

Difference between aspherical lenses and spherical lenses:

Under the premise of the same material and the same power, aspherical lenses are flatter, thinner, and have more realistic and natural vision than spherical lenses.

The spherical design of the lens increases the aberration and distortion, and there will be obvious unclear images, distortions, narrow fields of view and other undesirable phenomena.

The aspherical design corrects the image by reducing the aberration of the edge of the lens, solves the problems of distorted vision, makes the imaging more natural, and the field of view is wider, which can meet the needs of customers, 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.

Aspherical lenses are more comfortable and can reduce eye fatigue due to visual distortion. There are fewer and fewer spherical lenses on the market nowadays.

The sum of? The smaller the value, the greater the thickness of the edge of the lens grinding, which is cheaper than the lens. If you don't care about the thickness of the edges, you can use it at 800 degrees, which is what others say, "highly myopia, set up thick spectacle lenses".

It's all right, the higher the degree, the thicker.

Aspherical lenses with refractive index.

The thickness of the 500-degree edge is about 5mm (75mm diameter), the known lens is very expensive, the lowest ** is also about 500 yuan, the most expensive aspherical surface is 500, the two are much different, and the high refractive lens is very thin, 21% thinner than the non-ball closed code surface, light and comfortable.

If you buy more than 200, it is definitely a C-pole lens, not A

B pole, the problem is not big, as long as the technical indicators are qualified, everything is easy to say. The higher the refractive index, the thinner the lens.

Extended information: The tube image of the spherical lens is straight, while the outer surface of the aspherical lens reflects the fluorescent lamp.

The tube is like a barrel with a bulge in the middle and a gradual narrowing on both sides; The higher the luminosity, the more visible the lens.

For the inner low-gloss lens, the difference between the outer surface lamp image and the spherical mirror is very small, at this time, the reflection tube image on the outer surface should be viewed from the inner surface, the aspherical lens is also a barrel-shaped or obvious saddle-shaped deformation with a bulge in the middle and the image is large and slightly blurred, while the spherical lens is still straight.

Aspherical reading glasses.

It is not easy to distinguish between the tube image of the spherical mirror and the tube image of the spherical mirror, and we can look at the square beam method of the grid line to distinguish between the spherical and the aspherical. In general, + reading glasses above.

In the case of a spherical surface, placing it 10 cm above the grid paper with its convex side down will reveal a pillow-like deformation of the grid line with a depression in the middle (the so-called "pincushion distortion" in optics), while the grid effect of the aspheric mirror is corrected to be straight. The greater the degree, the more pronounced this difference becomes.

The 500-degree edge thickness of the aspherical lens with refractive index is about 5 mm (75 mm diameter), which is about 5 mm (75 mm diameter) than the lens, and it will be thinner after the trim is installed, about 3 mm. Celery shed.

It is difficult to say the thickness of the edge of the lens after processing.

Because yours is stared at with astigmatism.

The shaft position is also related.

Use a caliper to measure the thickness and degree of the center.

The thickness of the center is.

forgot. You can take a look at the bag when you buy lenses.

There's a sign on it.