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Multi-focus artificial lens

An intraocular lens, multifocal technology, applied in the direction of intraocular lens, eye implants, etc., can solve the problems of poor ability to resist tilt and eccentricity, reduce optical imaging quality, etc., to achieve enhanced characteristics and improve the effect of imaging quality

Active Publication Date: 2014-11-05
EYEBRIGHT MEDICAL TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen that the existing diffractive multifocal intraocular lenses on the market all have a certain positive or negative chromatic aberration, thereby reducing the optical imaging quality under polychromatic light conditions; There is some chromatic aberration, so its ability to resist tilting and eccentricity is poor

Method used

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example

[0068] Material properties: refractive index 1.46;

[0069] Surface shape: biconvex, aspherical front surface and spherical rear surface, the specific parameters are shown in Table 1 below.

[0070] Additional optical power: 3.68D.

[0071] Table 1

[0072] parameter Ra / mm Rp / mm T / mm R V Added power / D Best Practices 12.36 -12.06 0.80 1.46 54 3.68

[0073] Note: Ra is the radius of curvature of the anterior surface of the IOL; Rp is the radius of curvature of the posterior surface of the IOL; T is the central thickness of the IOL; R is the refractive index of the IOL; V is the Abbe number of the IOL.

Embodiment 1

[0088] Material properties: refractive index 1.41;

[0089] Surface shape: biconvex, aspherical front surface, spherical rear surface, diffractive slope ring is located on the rear surface, the specific parameters are shown in Table 2 below.

[0090] As far as the focal power: 15D.

[0091] Additional optical power: 3.05D.

[0092] Table 2

[0093] parameter Ra / mm Rp / mm T / mm R V Added power / D Best Practices 9.865 -9.565 1.0 1.41 58 3.05

[0094] Note: Ra is the radius of curvature of the anterior surface of the IOL; Rp is the radius of curvature of the posterior surface of the IOL; T is the central thickness of the IOL; R is the refractive index of the IOL; V is the Abbe number of the IOL.

[0095] Due to the natural dispersion characteristics of the refractive medium of the human eye, after polychromatic white light passes through the optical system of the human eye, the optical path difference (unit: wavelength) reaches more than 10 wave...

Embodiment 2

[0097] Material properties: refractive index 1.45;

[0098] Surface shape: biconvex, front surface aspherical, rear surface spherical, diffractive slope ring is located on the rear surface, the specific parameters are shown in Table 3 below.

[0099] The far focal power is 20D.

[0100] Additional optical power: 3.23D.

[0101] table 3

[0102] parameter Ra / mm Rp / mm T / mm R V Added power / D Best Practices 11.055 -11.355 0.90 1.45 58 3.23

[0103] Note: Ra is the radius of curvature of the anterior surface of the IOL; Rp is the radius of curvature of the posterior surface of the IOL; T is the central thickness of the IOL; R is the refractive index of the IOL; V is the Abbe number of the IOL.

[0104] Figure 5 According to the second preferred embodiment of the present invention, the multifocal intraocular lens with zero chromatic aberration characteristics is a schematic diagram of the change of the optical path difference with the pupil po...

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Abstract

The invention relates to a multi-focus artificial lens which comprises an optical part formed by an optical portion and an optical part edge. 6-35 diffraction slope rings are arranged on the front surface and / or the rear surface of the optical portion in a mirror symmetry manner according to the optical axis of the multi-focus artificial lens, a starting border position of the first diffraction slope ring is 0.580-0.520mm while a finishing border position of the same is 0.815-0.735mm, and feature size of the first diffraction slope ring is 0.125-0.048, so that color difference of the multi-focus artificial lens is enabled to be zero. Imaging quality of the multi-focus artificial lens under the condition of polychromatic light is improved, and characteristics of resisting inclination and decentration are enhanced, so that acquiring of super sight is facilitated.

Description

technical field [0001] The present invention mainly relates to the field of design of multifocal intraocular lenses. Specifically, the present invention relates to a diffractive multifocal intraocular lens with zero intrinsic chromatic aberration. Background technique [0002] A multifocal intraocular lens is an artificial lens that is implanted in the eye. For those skilled in the art, diffraction design on the surface of a monofocal IOL is a technical means commonly used to realize a multifocal IOL, and the multifocal IOL designed through this technical means is called a diffractive type. Multifocal intraocular lens. Diffractive multifocal intraocular lens is to etch a certain number of concentric micro-slope rings with diffraction ability on one of the optical surfaces. These micro-slope rings can make the light entering the human eye form two focal points at the same time. The position of the focus is determined by the add power. figure 1 It is a schematic top view o...

Claims

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Application Information

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IPC IPC(8): A61F2/16
Inventor 郭淑艳王曌解江冰
Owner EYEBRIGHT MEDICAL TECH BEIJING
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