What is the difference between aspherical lens and spherical lens?

A sphere is the whole surface with one curvature, just like cutting from a sphere, and a non-sphere is a different curvature, like maybe cutting from an ellipse. The purpose of the spherical aberration is to solve the problem of spherical aberration, because the spherical surface has different focal points for off-axis light rays, resulting in blurred vision.

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First of all, being able to make a sphere is a step forward for the lens manufacturing industry, making our solutions more flexible. On the other hand, the non-sphere, as the name suggests, is just not a sphere, but there are a lot of possibilities as to what exactly the face shape is. So there is a big difference between the non-sphere and the non-sphere, just as the curvature gradient of the same ellipse will be very different depending on the position of the cut, which determines the level of each manufacturer. So if you don’t feel comfortable with the lens don’t dismiss the technology, it may be that the lens manufacturer is using a design that isn’t right for you. In the final analysis, it is hoped that the imaging deformation of the off-center area will be smaller. Usually, manufacturers use the average parameters of the crowd, which are related to the distance between the eyes and the lens (nose height, orbital depth), and the geometry of the eye rotation. This can happen if your parameters are very different from the design parameters used.

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In the optical design of lens, the lens size and structure complexity can be greatly reduced by the effect of multiple lenses in one piece, but the design and processing requirements of this lens are relatively high.
Good for vision is definitely the “right non-sphere”. But it doesn’t matter if the sphere ADAPTS to nature, comparing vision is a subjective thing, as long as it’s comfortable.


Post time: Nov-17-2021