Focal depth expansion type intraocular lens and preparation method thereof

Abstract

The invention discloses a focal depth expansion type intraocular lens. The intraocular lens comprises an optical main body, a first supporting loop and a second supporting loop, and the optical main body has smooth phase distribution; the optical main body, the first supporting loop and the second supporting loop are of an integrated structure, are made of the same material and are integrally formed; the surfaces of the first supporting loop and the second supporting loop are provided with inclined sawtooth grooves or protruding frosted sand; and the optical main body is composed of two optical surfaces, and one optical surface is additionally provided with an annular belt structure. The free-form surface and the aspheric surface or the spherical surface are combined in the optical area of the optical main body, so that chromatic aberration is eliminated in a visible light range, the focal depth is larger, the image quality is better, high visual independence and few visual side effects are provided, and people have an excellent visual effect under the large-range focal depth.

Description

technical field [0001] The invention relates to the technical field of intraocular lenses, in particular to a depth-of-focus extended intraocular lens and a preparation method thereof. Background technique [0002] The natural lens in the human eye is a colorless, transparent and very soft lens when a newborn baby is born. As the age grows, the external environment changes, and under the influence of factors such as ultraviolet radiation, the natural lens will change. Hardens and turns into colored lenses. When people live to more than 50 to 60 years old, about 30% of the natural lens will become brown and cloudy, and harden, not only lose the function of adjustable focus, but even completely invisible When this happens, the natural lens (the cataract lens) will have to be replaced with an artificial lens to restore vision to the cataract patient's eye. [0003] Intraocular lenses (IOLs) have become a common medical device used to replace the diseased, cloudy natural lens,...

AI Technical Summary

Problems solved by technology

[0005] 1. Conventional monofocal IOL has only one image point, which can only meet the clear imaging under far vision distance (far object distance) after it is implanted in the human eye. After the operation, the intermediate vision required by the patient for many important daily tasks cannot be satisfied. Glasses are dependent, which is very inconvenient;

[0006] 2. Multi-focal IOL avoids the problem of insufficient viewing distance and provides clear imaging at multiple viewing distances. However, since the total light energy remains unchanged, the light energy of each image point is relatively low, the overall imaging is not clear, and the viewing distance is not continuous ;

The complex mechanical structure is unstable in the human eye and can easily induce secondary cataracts

In summary, the mechanical adjustable focus lens made of silica gel, only some people can have the function of adjustable focus, and it is not safe

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