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Free-form surface progressive multi-focus-point lens and design method thereof

A progressive multi-focus, design method technology, applied in glasses/goggles, optics, instruments, etc., can solve the problems of large astigmatic aberration, reduce the effective visual area of ​​the lens, etc., achieve small astigmatism value, soft astigmatism distribution , the effect of short channels

Active Publication Date: 2013-01-30
SCHOOL OF OPHTHALMOLOGY & OPTOMETRY WENZHOU MEDICAL COLLEGE
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This means that shorter gradient channels will produce greater astigmatic aberrations while reducing the effective visual area of ​​the lens

Method used

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  • Free-form surface progressive multi-focus-point lens and design method thereof
  • Free-form surface progressive multi-focus-point lens and design method thereof
  • Free-form surface progressive multi-focus-point lens and design method thereof

Examples

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Embodiment 1

[0039] A progressive multifocal lens with a free-form surface. The lens includes two front and rear working surfaces. The inner surface of the lens is a complex non-rotationally symmetrical free-form surface, the outer surface is a spherical surface, and the lens diameter is 60 mm. Lenses can provide clear vision all the way, including distance vision, intermediate vision and near vision.

[0040] The present embodiment will be further described below in conjunction with the accompanying drawings.

[0041] attached figure 1It is the change curve of the surface spherical diameter of the inner surface of the free-form progressive multifocal lens along the meridian umbilical line. The surface spherical diameter of the far-use area basically remains unchanged at -6.50D. From the far-use area to the optical center of the lens, the surface spherical diameter The variation range of degree is less than 0.05D. In the far zone, the change of the surface spherical diameter is less than...

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Abstract

The invention relates to a lens and a design method thereof and particularly relates to a free-form surface progressive multi-focus-point lens and a design method thereof. The free-form surface progressive multi-focus-point lens disclosed by the invention adopts an expanded axial symmetry quadric surface formula to establish an initial facial form; and a quadric surface coefficient and a curvature parameter of each point on the surface are iterated and optimized to obtain the final facial form and the optical property. According to the free-form surface progressive multi-focus-point lens and the design method thereof, an image astigmatism region is greatly compressed, the maximum astigmatism value is reduced, the astigmatism distribution is softer, the width of a channel is increased, an effective vision range of the lens is obviously increased, and the comfortable degree of a wearer can be effectively improved; and the luminosity degree can be increased to be more than +0.03D. The lens is especially suitable for a presbyopia ametropia patient more sensitive to an image difference.

Description

technical field [0001] The invention relates to a lens and a design method thereof, in particular to a free-form surface progressive multi-focus lens and a design method thereof. Background technique [0002] Presbyopia is a major visual defect in the elderly population. Presbyopia wearers need vision correction at different distances, such as far, medium, and near, so they require different refractive correction functions to be integrated into the same lens to form glasses with multiple focal points. Traditional bifocals and trifocals can only achieve vision correction for several discrete distances in several discrete visual areas, and cannot obtain continuous vision throughout the entire process, and there are obvious image jumps at the boundaries of different visual areas. Affects wearing comfort. [0003] The progressive multi-focal lens based on the free-form surface technology overcomes the above-mentioned problems, and provides the wearer with continuous and clear ...

Claims

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Application Information

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IPC IPC(8): G02C7/02G02C7/06G02B27/00
CPCG02C7/02G02C7/06G02B27/00G02C7/028G02C7/061
Inventor 厉以宇陈浩瞿佳余景池冯海华毛欣杰
Owner SCHOOL OF OPHTHALMOLOGY & OPTOMETRY WENZHOU MEDICAL COLLEGE
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