Dual-focus intraocular lens design based on eye model

Abstract

The invention belongs to the technical field of medical instruments, and comprises the design methods of a refractive multi-focus intraocular lens and a diffractive multi-focus intraocular lens. During designing the refractive multi-focus intraocular lens based on the eye model, a dual-spherical intraocular lens is designed firstly; then, one surface of the intraocular lens is divided into a plurality of optical areas along the radial direction; and the curvature radius of each optical area on the surface of the intraocular lens is directly optimized by Zemax optical design software to make the light of the optical area for distant vision focused on the retina when the object distance is infinite or to make the light of the optical area for near vision focused on the retina when the object distance is the reading distance (33 cm). During designing the diffractive multi-focus intraocular lens based on the eye model, a dual-spherical intraocular lens is designed firstly to achieve the degree of myopia of 1.5D; then, a binary surface is introduced on one surface of the intraocular lens; and the phase coefficients of the binary surface are optimized directly to make the (-1)-order diffraction focus focused on the retina when the object distance is infinite or to make the (+1)-order diffraction focus focused on the retina when the object distance is the reading distance.

Description

technical field [0001] The invention belongs to the technical field of medical equipment. Background technique [0002] After the cataract eye is implanted with an intraocular lens, it loses its normal adjustment ability. In order to compensate and adjust, people have designed refractive and diffractive bifocal IOLs, and the design method is as follows: [0003] (1) For the refractive bifocal intraocular lens, first design a bispherical intraocular lens for distance vision, then divide one of its surfaces into several annular zones in the radial direction, and add a diopter of 3.5D to the annular zone for near vision , As far as the annulus does not need to add diopters. [0004] (2) For diffractive bifocal IOLs, a Fresnel zone plate is added to one surface of the bispherical IOL, using the Fresnel zone plate’s -1-order diffracted light to see distance, and +1-order diffracted light For near vision, the diopter difference between ±1st order diffraction focal points is 4D....

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the currently used design method is to directly introduce a refraction multi-region structure or a diffraction structure on the surface of the intraocular lens, which does not consider factors such as the human cornea, eye axis length, etc., and does not use object distance, so it is not perfect

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