Presbyopia correction device based on improved fractal zone plate

Abstract

The invention relates to a presbyopia correction device based on an improved fractal zone plate. According to the radius alpha, fractal level S, and light transmission ratio w within the period of the improved fractal zone plate, focusing of objects at different distances can be realized. A common artificial crystal material for the cataract surgery and the traditional binary phase type optical element process are used for processing. The improved fractal zone plate device can be used for presbyopia correction, thereby realizing clear object watching at a distant vision distance, a conversation distance, a computer working distance, or a reading distance. Therefore, a demand of clear imaging of objects at several kinds of distances by the presbyopia patients can be satisfied; the system has a simple structure; and convenient processing is realized. The device has the potential value in the presbyopia correction field.

Description

technical field [0001] The invention belongs to the technical field of vision correction. Background technique [0002] With the development of the aging trend of the population structure, the attention of the country and society to the visual health of the middle-aged and elderly people is increasing year by year. Presbyopia not only brings great inconvenience to middle-aged and elderly people's daily reading and work, but also increases the safety hazards of middle-aged and elderly people and the incidence of traffic accidents in society. Against the backdrop of an aging population structure, the development of presbyopia correction technology is urgent and significant. [0003] The normal human eye, as an optical imaging system with automatic focusing capability, can clearly image objects within a considerable continuous distance range. This automatic focusing is realized through the deformation and movement of the human eye lens. This process is called the human eye. E...

AI Technical Summary

Problems solved by technology

At present, most of the intraocular lenses designed to restore the continuous visual range of the human eye are bifocal intraocular lenses. The main defect (some of which can be overcome by the new trifocal design) is that they can clearly see two points in the distance and near, and the middle part cannot see clearly. clear

In order to overcome this defect, a lightsaber intraocular lens appeared, and the lightsaber element was introduced into the eye model as an intraocular lens. Although a large depth of focus performance has been achieved, the processing of this element is complicated

In recent years, aspherical IOLs have also appeared. By adding appropriate spherical aberration, multi-focal performance has been achieved, but the selection of the object distance position cannot satisfy the reading distance.

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