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Large depth of focus aspheric diffractive intraocular lens

An intraocular lens, aspheric technology, used in intraocular lenses, eye implants, etc.

Active Publication Date: 2018-12-28
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings of the existing artificial lens, provide a large focal depth aspheric diffractive artificial lens for correcting presbyopia, and improve the optical performance of implanted artificial lens

Method used

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  • Large depth of focus aspheric diffractive intraocular lens
  • Large depth of focus aspheric diffractive intraocular lens
  • Large depth of focus aspheric diffractive intraocular lens

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0024] Such as figure 1 Shown is a side view of a large depth-of-focus aspheric diffractive IOL. The aspherical diffractive intraocular lens includes an anterior surface 1 and a posterior surface 2 of an optical part. The artificial lens is axially symmetrical as a whole, the front surface and the back surface of the optical part are convex aspheric surfaces, and a diffraction ring is attached to the back surface.

[0025] Through optimization, an aspheric diffractive intraocular lens with large depth of field (600mm-5000mm object distance) and additional optical power (400mm) was finally designed. The material is PMMA, the refractive index is 1.494, and the Abbe number is 51.27. The surface type of the front surface and the back surface can be described as

[0026]

[0027] Among them, a 1 ~a 4 They are the even-order aspheric coefficients from the 4th order to the 10th order, c is the curvature at the apex of the aspheric surface, r is the distance from any point on t...

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Abstract

Big coke focal sphere diffractive artificial lens, is an artificial lens for replacing presbyopia eye natural crystal and for rectifying presbyopia eye. The artificial lens is prepared from polymethyl methacrylate material. the front and back surfaces of the artificial lens are twin convex aspherical surfaces symmetrical along the axial direction, the degree of diopter is 22D, the diameter of the optics department is 4.6mm, the back surface has a diffraction ring providing additional light focal power. The artificial lens has large depth of focus performance, planting the artificial lens eye model, can form images clearly at successive distances of 400mm to 5000mm.

Description

technical field [0001] The invention belongs to the field of refraction-diffraction hybrid ophthalmic lenses, and in particular relates to an artificial lens with a large depth of field performance, that is, it can provide the human eye with a continuous range of clear vision. technical background [0002] Healthy and young human eyes can see objects from the distance of clear vision to infinity through adjustment. However, after the age of 40, the adjustment of the human eye gradually loses, and the near point gradually moves away. In the end, only objects at a certain distance can be seen clearly, and the so-called presbyopia appears. At present, as our country enters an aging society, the number of people whose eyesight is troubled by presbyopia is quite large. Therefore, the correction of presbyopia is extremely important, and has a very broad market prospect at the same time. [0003] The use of intraocular lenses to correct presbyopia has been generally accepted. Fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61F2/16
CPCA61F2/1618
Inventor 刘永基姜来
Owner NANKAI UNIV
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