Whether the lens is spherical or asphericWhether the lens is spherical or aspheric?

Howtos

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Spherical lens features

A spherical lens means that both the inner and outer sides of the lens are spherical, or the other side of the lens is flat (as if cut from the sphere), which is a spherical lens. But the spherical surface also has shortcomings. It is obvious that the little friends wearing glasses will suddenly realize.

Disadvantages of spherical lenses: the surrounding objects will be distorted (the higher the degree is more obvious), the aberrations and deformation will increase, and the obvious image unclear, distortion, narrow vision and other undesirable phenomena will restrict the wearer. The vision and the authenticity of the object. So in order not to let the object deform, we humans have developed aspherical lenses.

Aspherical lens features

In order to make the lens not deform, it is necessary to change the curved surface of the lens. According to this design principle, the aspheric surface minimizes the aberration of the lens edge, corrects the spherical image, and solves the problem of distortion of the horizon.

So what are the benefits of aspherical lenses than spherical lenses?

1, the object disguised small: aspherical lens complements the biggest shortcoming of the spherical surface - visual distortion.

2, the object is realistic: the aspherical lens uses a variety of curvature radius design on the convex surface of the lens, compared with the spherical lens can obtain the same visual effect as the emmetropic eye, making the object more realistic, more natural and comfortable.

3. The lens is lighter and thinner: the thickness of the lens is relatively reduced due to the reduced curvature of the aspherical lens. In the case of the same degree, it is about 50% thinner than the spherical lens of the spherical lens; the myopia lens is about 20% thin, and the aspherical lens is lighter, thinner and flatter than the spherical lens under the same degree.

4, the gospel of high myopia: in the case of high diopter (500 degrees or more), the aspherical lens will be more real and natural, the field of view is wider, and can also reduce the visual fatigue induced by visual distortion.

How to distinguish between aspherical lenses and spherical lenses?

1. By hand from the center of the lens to the side, you will feel very flat. If you have the above feeling, it should be an aspherical lens;

2. Look at the shape of the lens coating on the lamp tube. Generally, the lamp reflected by the spherical lens is straighter (except for the high diopter lens); the non-spherical lens has a larger curvature due to the different curvature of the surface.

So everyone knows how to choose the right lens for you?