multifocal intraocular lens

Abstract

The invention provides a multi-focal artificial lens. The front surface or the rear surface of an optical portion of the multi-focal artificial lens or the front surface and the rear surface of the optical portion of the multi-focal artificial lens are in the shape of an aspheric surface. According to the multi-focal artificial lens, an appropriate depth of field is provided for the multi-focal artificial lens through the aspheric surface design, the defect of intermediate-range eyesight of a multi-focal artificial lens in the prior art is overcome, and full-range eyesight of the long range, the intermediate range and the short range of the multi-focal artificial lens is achieved.

Description

technical field [0001] The present invention relates to an intraocular lens. In particular, the present invention relates to a multifocal intraocular lens. Background technique [0002] Cataract patients undergo surgery to remove the original diseased natural lens and implant an intraocular lens to obtain postoperative vision. In recent years, the clinical application of multifocal intraocular lenses has provided ophthalmologists with new methods and means to improve the visual quality of cataract patients after surgery. Among them, the multifocal intraocular lens is developed on the basis of the monofocal intraocular lens. Specifically, the optical surface of the monofocal intraocular lens is realized by applying a refraction ring optical zone or an etched diffraction ring structure, using refraction or The optical principle of diffraction separates the light rays incident on the lens and creates multiple focal points, so that the light rays from distant and near objects ...

AI Technical Summary

Problems solved by technology

[0003] figure 1 and figure 2 Given is the global visual acuity curve of the multifocal intraocular lens in the prior art with the spherical aberration of the multifocal intraocular lens being -0.27 μm and -0.20 μm respectively in the Liou-Brennan human eye model and the additional power is +3D, from It can be seen from the figure that although the far and near distance vision is good, both are above 1.5, but within the range of object distance 0.6-1.0m, the vision is less than 0.5, that is, the medium-distance vision is very poor and cannot meet the requirements of functional vision.

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