Ask, is it cost effective to replace the spherical mirror of 1 56 with the aspheric surface of 1 61,

First of all, you have to know what spherical lenses and aspherical lenses are and the difference between them, which can be found on the Internet, and secondly, it depends on whether you have requirements for clarity The refractive index is much higher than the refractive index, that is, it is much clearer, as for how much to add, unless your family is very poor, 60 yuan is very important to you, then you don't need to add icing on the cake.

I think it's a good deal if the quality is consistent

My dear, do you believe me when I say it's not worth it?

Aspherical lenses, refers to aspherical lenses with refractive index.

Lens refractive index.

Lenses are superscripted74 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.

Brief introduction. The surface curvature of aspherical lenses is different from that of ordinary spherical lenses, and in order to pursue the thinness of the lens, it is necessary to change the curved surface of the lens.

and the distortion increases, and the result is obvious unclear images, distorted vision, narrow field of vision and other undesirable phenomena. Now the aspherical design corrects the image, solves the problem of 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.

In the era of continuous technological advancement, aspherical design, an optical miracle, reduces the aberration of the edge of the lens to the bottom, so that its wide field of view can meet the needs of customers.

Aspherical lenses have a flatter base curve and lighter weight, making them look more natural and beautiful. in diopters.

In the case of high temperatures, it can reduce the distortion of the eyes, and for consumers with high visual acuity, aspherical lenses may be more suitable.

Spherical lenses refer to lenses with a refractive index of a potato-shaped spherical design.

Difference between spherical lenses and spherical lenses:

1. The refractive index of the lens is different

The refractive index of a lens is the ratio of the speed of light propagation in a vacuum to the propagation speed of light in the lens material, reflecting the ability of the lens to refract light. The refractive index of the former is, and the refractive index of the latter is;

2. Different thicknesses:

All things considered, the higher the refractive index of the lens, the thinner the lens. The lenses are thinner than those of the lenses, making them more aesthetically pleasing.

3. Different weights:

All things considered, the higher the refractive index of the lens, the lighter the lens. The lenses are heavier than those of the lenses and are more comfortable to wear.

Extended Materials. Lenses can be divided into spherical lenses and aspherical lenses according to curved surface processing.

1. Spherical lenses.

The two sides of the lens are spherical arcs, and when light rays of different wavelengths are parallel to the optical axis.

When incident is applied to different positions on the lens, it cannot be focused into a point on the plane, resulting in aberrations.

The number of shadows is distorted to see objects around the lens, which limits the wearer's field of vision.

2. Spherical lenses.

The aspheric design corrects the image and solves the problem of distorted vision.

The advantages of aspherical lenses are:

1. Clearer.

The aspherical lenses with a special coating treatment have a perfect visual performance, presenting a clearer and more comfortable visual effect.

2. Easier.

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

3. More natural.

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.

Summary. The thicker the lens, the deeper the power of the eye, and generally the power of the left and right eyes is different, so the thickness of the lens is also different.

Are aspherical lenses good.

Kiss! Hello <>

This is very good, the refractive index lens is thinner than the ruler, and it is lighter, which is very suitable for about four degrees, but the lens is not very wear-resistant, but this lens is very hard, not weak and easy to break.

Hello, I would like to ask, does the thickness shown above refer to the center thickness or the edge thickness?

Centre. Because the thickness of the edge is not the same as the thickness of the center.

Is it okay for my left eye to be 550 degrees and my right eye to be 150 degrees with this refractive index? What could be better than this?

Yes, but you can match this with this degree.

It means that the refractive index can be given to Lu Shiwu, is there a refractive index that can be matched with a higher refractive index, which is not better for eye protection? What is the thickness of the edges of the lenses with this center thickness?

It only has to do with the thickness of the lens.

Yes, I mean that the lenses with a higher refractive index are not thinner and more comfortable.

The left and right eyes are not the same, and the lenses are not very thick, which is not very uncomfortable.

A thinner one doesn't look like the lenses are too much.

The lenses are not too thick.

The thicker the lens, the deeper the power of the eye, and generally the power of the left and right eyes is different, so the thickness of the lens is also different.

Therefore, generally this kind of wearing eyes will not be suitable for a while, and it will be good after some time.