A Posterior Chamber Lens with Toric Surface Design

Abstract

The invention belongs to the field of ophthalmic lens technology, and relates to the technology of an intraocular posterior chamber lens providing compensation to the cornea, in particular to a posterior chamber lens designed with a toric surface. The posterior chamber lens with a toric surface design of the present invention includes an optical body and a plurality of haptics, the diameter of the optical body is ≤ 6.5 mm, and any one of the front optical surface or the rear optical surface of the optical body is a toric surface design . The posterior chamber lens with the toric surface design of the present invention not only provides astigmatism correction, but also provides a weak negative spherical aberration to compensate for corneal positive spherical aberration while maintaining a good visual focal depth; on the other hand, based on this high-innovation biological phase Capacitive material, compared with the existing intraocular lens, under natural light conditions, the toric surface design eye posterior chamber lens of the present invention has excellent visual imaging quality, which is compared with monochromatic light with a wavelength of 550nm under natural light conditions Under these conditions, MTF drops very little.

Description

technical field [0001] The invention belongs to the field of ophthalmic lens technology, and relates to the technology of an intraocular posterior chamber lens providing compensation to the cornea, in particular to a posterior chamber lens designed with a toric surface. Background technique [0002] At present, my country has entered an aging society, and the incidence of cataract in the elderly is getting higher and higher. Among them, senile cataract combined with corneal astigmatism is a very common refractive error. The epidemiological investigation found that about 36% of the corneas had 1.0D-2.0D astigmatism, 8% had 2.0D-3.0D astigmatism, and 26% had more than 3.0D astigmatism. Clinical observations have found that 1.0D corneal astigmatism can lead to decreased vision and visual quality, so astigmatism will affect the recovery of vision after cataract surgery, resulting in a decrease in quality of life. [0003] Astigmatism is a refractive error of the eye, which is r...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a posterior chamber lens with a toric surface design, which can correct the astigmatism caused by the cornea, compensate for the decline in imaging quality caused by corneal spherical aberration after the natural lens of the human eye is replaced, and overcome several generations of artificial lenses at the same time. Deficiencies in the optical properties of lens materials, lenses with good performance and biocompatibility

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