Asphericity eyeglass

Abstract

The present invention discloses an aspherical lens, including two refracting surface, in which at least one refracting surface is aspherical surface. Said invention also provides a formula for solve its form, and can obvisouly thin the lens, and make the field curvature superpose on the bend of far point spherical surface basically so as to make lens obtain excellent imaging quality.

Description

technical field [0001] The invention relates to an spectacle lens, in particular to an aspherical spectacle lens. By selecting the shape of the aspheric surface, the effect of better imaging quality and thinner thickness of the lens can be achieved, and the spectacle lens can be applied to nearsighted glasses and farsighted glasses. Background technique [0002] Spectacle lenses used to correct nearsightedness or hyperopia are usually lenses that include two refractive surfaces. The two refractive surfaces of traditional lenses are spherical, which is convenient for processing. Hyperopia glasses are thicker in the middle and thinner at the edge. Due to the strength requirement for the thinnest part of the lens, the thickness of the entire lens is increased, which not only affects the appearance, but also causes discomfort to the wearer. In order to solve this problem, people began to design aspherical spectacle lenses to offset the overall thickening ...

AI Technical Summary

Problems solved by technology

[0002] Spectacle lenses used to correct nearsightedness or hyperopia are usually lenses that include two refractive surfaces. The two refractive surfaces of traditional lenses are spherical, which is convenient for processing. Hyperopia glasses are thicker in the middle and thinner at the edge. Due to the strength requirements for the thinnest part of the lens, the thickness of the entire lens is increased, which not only affects the appearance, but also causes discomfort to the wearer.

In order to solve this problem, people began to design aspherical spectacle lenses to offset the overall thickening of the lenses caused by the thickness of the center and edge of the lenses formed by two different curvature spherical surfaces. For example, Chinese invention patent application CN1212766A discloses a For aspheric spectacle lenses, the curvature at each point of the spectacle lens is changed by introducing high-order corrections, thereby reducing the thickness difference at each point of the lens. However, in this application, the high-order terms introduced include odd and even The second term will lead to the asymmetry of the refractive surface of the lens, and it is difficult to design a lens that meets the requirements, and the introduction of the conic constant K increases the design difficulty, so it is difficult to realize in the actual lens design. In addition, the field curvature of the traditional spherical lens The non-coincidence with the required far-point spherical surface makes its imaging quality inevitably decrease with the increase of the field of view, which it does not take into account

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