Shot-distance-vision-intensified full-visual-range diffraction artificial lens

Abstract

The invention discloses a diffraction artificial lens. The diffraction artificial lens comprises a diffraction structure area and a refraction structure area, wherein the diffraction structure area comprises a first diffraction structure area body, a second diffraction structure area body and a third diffraction structure area body sequentially distributed from a center area of the optical surfaceof the artificial lens to the edges; the first diffraction structure area body comprises a first diffraction focus for distant vision and a second diffraction focus for short vision; the second diffraction structure area body comprises a third diffraction focus for distant vision, a fourth diffraction focus for middle vision and a fifth diffraction focus for short vision; the third diffraction structure area body comprises a sixth diffraction focus for distant vision, a seventh diffraction focus for middle vision and an eighth diffraction focus for short vision. The first diffraction focus, the third diffraction focus, the sixth diffraction focus and a focus of the refraction area are coincided; the fourth diffraction focus and the seventh diffraction focus are coincided; the second diffraction focus, the fifth diffraction focus and the eighth diffraction focus are coincided. The whole lens forms three focuses of the distant vision, the middle vision and the short vision.

Description

technical field [0001] The invention relates to the field of medical devices, and more specifically relates to a full-range diffractive intraocular lens with enhanced near-distance vision. Background technique [0002] In related technologies, after cataract surgery, the diffractive intraocular lens that replaces the natural lens makes the incident light converge on different diffraction orders through the diffraction effect on light, and different diffraction orders correspond to different crystal powers. Diffraction crystals can produce 2 or more than 2 focal points, which enables patients not only to see far away, but also to achieve vision requirements for other distances, thereby getting rid of the patient's need for glasses (patients implanted with aspheric single focus lenses can see Nearby, such as reading newspapers, etc., all need glasses). Through the adjustment of the diffraction structure, the energy distribution on different diffraction orders can be realized,...

AI Technical Summary

Problems solved by technology

The current diffractive IOLs are basically designed based on the idea of ​​synchronous energy dispersion when adjusting the diffraction structure. However, due to the synchronous dispersion of energy, the imaging effect of each focal point will deteriorate, and the imaging contrast will decrease. influence each other

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