Trifocal artificial lens and manufacturing method thereof

Abstract

The invention relates to a trifocal artificial lens and a manufacturing method thereof. The front surface and/or the rear surface of an optical part of the trifocal artificial lens are/is designed through an aspheric surface, and are/is of a diffraction ladder structure, the heights of every two adjacent diffraction ladders are alternately changed, and in a standard human eye model, the longitudinal spherical aberrations of the trifocal artificial lens at the retina under the 0-6 mm clear aperture are all negative values; meanwhile, as the clear aperture is increased, the absolute values of the longitudinal spherical aberrations are increased, and the longitudinal spherical aberrations of the trifocal artificial lens at the retina under the 0-6 mm clear aperture are within minus 0.26 mm tominus 0.85 mm. By means of the trifocal artificial lens, far, middle and near full-range vision is provided, and vision loss does not exist within any distance. Compared with multifocal and trifocallenses in the prior art, the contrast sensitivity of the trifocal artificial lens in the middle-range vision is obviously improved.

Description

technical field [0001] The present invention relates to a trifocal intraocular lens and a method for its manufacture. More specifically, the present invention relates to trifocal intraocular lenses for improving intermediate-range vision and methods of making the same. Background technique [0002] Looking at the visual quality standards for cataract surgery, they have gradually improved over the past few decades. Thirty years ago, cataract patients were considered successful from preoperative blurred vision to being able to distinguish five fingers postoperatively; if postoperatively, they were able to see fingers 1 meter away or a dining table 5 meters away, they were satisfied. Twenty years ago, if the uncorrected distance visual acuity reached 0.5 after cataract surgery, it would have delighted patients. Ten years ago, if the uncorrected distance visual acuity could reach 1.0 after cataract surgery, the surgeon would be proud of it. Today, surgeons and patients will n...

AI Technical Summary

Problems solved by technology

[0012] The present invention aims at the disadvantages of the existing technology, such as the limited adjustment range of the adjustable intraocular lens, partial loss of mid-range visual acuity and low contrast sensitivity of the multifocal intraocular lens an

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