Posterior chamber type artificial crystal

Abstract

The invention relates to a posterior chamber type artificial crystal which is provided with the design of an optical part capable of improving the image quality with a highly convex rear surface. By adopting the design of highly convex surface for the optical part of the posterior chamber type artificial crystal, and by adopting the design of a high-order aspheric surface or additionally adopting the design of a composite ring curve, the distance between the rear surface of the artificial crystal optical part and a rear sac is shortened, the stability of the artificial crystal in the space position of the sac is improved, the advantage of the square edge effect on the optical part edge of the artificial crystal is enabled to be better presented, and the morbidity of PCO (posterior capsular opacification) is reduced after the artificial crystal is implanted; and since the front surface of the optical part is slightly flat, the loop of the artificial crystal (particularly the loop of one one-piece posterior chamber type artificial crystal) is enabled not to be tightly pressed onto the front surface of the optical part during folding process, the loop is more easily unfolded after being implanted into an eye, the situation of mutual adhesion between a support loop and the optical part cannot occur, and the imaging quality of the artificial crystal and / or the vision quality of an astigmia patient can be improved.

Description

technical field [0001] The present invention mainly relates to posterior chamber intraocular lenses. Specifically, the present invention relates to a method that can not only improve the stability of the intraocular lens in the capsular bag, and reduce the incidence of secondary cataract (PCO) after intraocular lens implantation, but also improve the imaging quality of the intraocular lens and / or Or a posterior chamber type intraocular lens with a significantly convex posterior surface of the optic (apparent kyphosis) that improves the visual quality of patients with astigmatism. Background technique [0002] An intraocular lens (IOL) is an artificial lens that can be implanted into the eye to replace the natural lens in a person's eye that has become cloudy due to cataract disease, or for refractive surgery to correct the eye's vision. The shape of the intraocular lens is usually composed of a circular optical part and supporting haptics arranged around the periphery. The...

AI Technical Summary

Problems solved by technology

However, in order to improve the stability of the spatial position of the IOL in the capsular bag and reduce the incidence of secondary cataracts after IOL implantation, if the rear surface of the optical portion of the prior art IOL is designed with a small radius of curvature, then the It must be at the expense of part of the imaging quality of the prior art IOL

Therefore, those skilled in the art need a posterior chamber intraocular lens with obvious kyphosis in the optical part that can improve the poor imaging quality of the prior art kyphotic intraocular lens

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