Difference between spherical and aspheric lenses

In daily life, when observing other people's glasses, you will find that how can some people's glasses have different colors? It may be anti blue light or anti ultraviolet glasses. Is it better to choose the lens inside the glasses, spherical or aspherical? Let's keep looking down.

Aspherical lens: now the aspherical design corrects the image and solves the problems of distortion of field of view. At the same time, it makes the lens lighter, thinner and flatter. Moreover, it still maintains excellent impact resistance, so that the wearer can use it safely. So far, the design of aspheric lens refers to the continuous change of diopter from the optical center area to the edge part, and its change curve is in the shape of parabola, which determines that the luminosity of this kind of lens decreases gradually from the optical center to the surrounding area. The lens is not spherical radian, and its cross section is planar. When the light is incident on the aspheric mirror, the light can focus on one point and eliminate all kinds of aberration. The advantage of this design over spherical lens design is that it has clearer, easier and more natural lens characteristics. Spherical lens: spherical lens spherical lens refers to that both inner and outer sides of the lens are spherical, or one side is spherical and the other half is flat.

The difference between the two is that the aspherical lens is smoother and thinner when the same material is used. The difference with the naked eye is to observe the coating shape of the lens under the lamp tube. Generally, the lamp tube reflected by the spherical lens is relatively straight (except for the high diopter lens); The shape and curvature of the lamp reflected by the aspheric lens are large.