Progressive additional lens and preparation method thereof

Abstract

The invention discloses a progressive additional lens and a preparation method thereof. According to the prior art, on the basis of acquiring initial rise data of an additional lens surface shape, an optimization method for acquiring small-area local correction surface rise by solving a partial differential equation introducing an optimization function is established. The optimization function is that an optimization factor is added into a lens surface shape average curvature distribution function, the lens surface shape rise is finally obtained by regulating the optimization factor and performing multiple iteration, and the lens is processed, so that the width of an area with the astigmatism less than or equal to 0.25 dioptry in a middle transition area corresponding to the provided lens is increased by more than or equal to 1mm, and the optical property in an effective visual area is not changed basically; therefore, the initial design parameters and the optical property of the lens are kept not changed, the dioptry and the astigmatism distribution of the lens better meet the requirements of wearers.

Description

technical field [0001] The invention relates to an ophthalmic lens technology, in particular to a progressive multifocal ophthalmic lens and a preparation method thereof. Background technique [0002] Progressive multifocal ophthalmic lenses can meet the needs of distance vision and near vision at the same time, and avoid the defects of bifocal lenses such as visual breakage when switching from distance to near vision. At present, progressive multifocal ophthalmic lenses are widely used. See attached figure 1 , The surface of the progressive multifocal ophthalmic lens is divided into a distance zone 1, an intermediate transition zone 2, a near zone 3 and an astigmatism zone 4. Far vision zone: the wide area located in the upper half of the progressive multifocal ophthalmic lens, which corrects the distance vision ability when the human eye is in a relaxed state of vision, providing a clear and wide field of vision. Near vision zone: It is located about 10-18mm below the ce...

AI Technical Summary

Problems solved by technology

Among the various methods used in the prior art, although they have their own characteristics, what they have in common is that the surface sagittal height of the lens is obtained according to the design parameters, and most areas of the corresponding lens surface shape can meet the design requirements, but there are Defects such as the middle channel is not wide enough or the peripheral astigmatism is too large

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