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A progressive multifocal ophthalmic lens and its design method

A progressive multi-focus, design method technology, applied in glasses/goggles, optical components, instruments, etc., can solve the problems of long channel length and insufficient vision in the near-sighted area, and achieve short channel length, large design range, and increased The effect of visual range

Active Publication Date: 2019-04-12
浙江东方光学科技有限公司
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Problems solved by technology

[0005] The above-mentioned prior art involves the contour line cluster of the progressive multifocal ophthalmic lens, and the progressive multifocal ophthalmic lens thus designed does not have a wide enough near vision field and a long channel length.

Method used

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  • A progressive multifocal ophthalmic lens and its design method
  • A progressive multifocal ophthalmic lens and its design method
  • A progressive multifocal ophthalmic lens and its design method

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Embodiment 1

[0025] In this embodiment, the lens to be processed is the rear surface of the inner progressive lens, the radius R of the lens is 36mm, and the focal power of the far zone is -4 diopters, near vision It is -2 diopters, and the focal power of the lens is 2 diopters. Set the lens gradient channel length h as 28mm, and the distance L from A to the lens center point 0 as 14mm. The lens material has a refractive index of 1.523. The lens design steps are as follows:

[0026] 1. Set the coordinates of the lens as follows: the positive direction of the y-axis is horizontal to the right, the positive direction of the x-axis is vertically downward, and the positive direction of the z-axis is perpendicular to the paper and points to the reader. The unit of length is mm. Let A be the reference point for far vision on the lens, B the reference point for near vision on the lens, and the line connecting point A to point B goes down the x-axis, called the meridian, and the length is h. ...

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Abstract

The invention discloses a progressive multi-focus ophthalmic lens and a design method thereof. Using a function with adjustable parameters as the contour line equation of the progressive multifocal ophthalmic lens, combined with the power distribution on the meridian, the surface curvature radius of the progressive multifocal ophthalmic lens is designed, and then the surface shape of the progressive multifocal ophthalmic lens is determined . The progressive multi-focal ophthalmic lens provided by the invention has the characteristics of large visual range in the near area and short channel length, and can effectively reduce the visual fatigue of the wearer.

Description

technical field [0001] The invention relates to a progressive multi-focal ophthalmic lens and a design method thereof, in particular to a method for designing the progressive multi-focal ophthalmic lens by using a special function as the contour line equation of the progressive multi-focal ophthalmic lens. 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 vision breakage when switching from distance vision to near vision. At present, the application of progressive multifocal ophthalmic lenses is becoming more and more extensive. See attached figure 1 , The surface of the progressive multifocal ophthalmic lens is divided into a distance zone 1, a gradient channel (middle transition zone) 2, a near zone 3 and an astigmatism zone 4. The distance vision area is used to observe distant objects, correct the distance vision ability when the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02C7/02G02C7/06
CPCG02C7/024G02C7/028G02C7/061G02C7/063
Inventor 张皓陈芒保吴泉英唐运海陈晓翌钱霖
Owner 浙江东方光学科技有限公司
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