Vision correcting device for presbyopia

Abstract

The invention relates to the technical field of optics, and discloses a vision correcting device for presbyopia in order to optimize the user experience and realize convenience and light weight. The device comprises a linear polarizer, a first slab lens based on an electrically controlled birefringence material, a quarter-wave plate between the linear polarizer and the first slab lens, and a voltage control system used for switching the slab lens in order to enable the first slab lens to realize nonzero diffraction light beams at the same stage to be equivalent to a convex lens to focus the light beam at a real focus in a free electric field corresponding to circuit opening of the voltage control system, and to realize a function of being equivalent to a slab window sheet in a saturated electric field corresponding to circuit closing of the voltage control system.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a vision correction device for presbyopia. Background technique [0002] The core principle of the vision correction device is to diverge or focus the ambient light incident on the human eye to a certain extent through the optical system, so that the imaging beam can finally focus on the retina of the human eye. Existing technical solutions for vision correction generally use traditional curved concave / convex lenses to realize the divergence / focus of light beams. The disadvantages are: 1. The lens is thick and heavy, especially for high myopia above 1000 degrees. It reaches about 10mm; 2. The curved lens is not an ideal optical system, and it cannot form a perfect image. There must be aberrations, which makes the scene perceived by the human eye deviate from the reality. [0003] It is worth explaining that presbyopia, like hyperopia, cannot see things close up clearly, and nee...

AI Technical Summary

Problems solved by technology

Existing technical solutions for vision correction generally use traditional curved concave / convex lenses to realize the divergence / focus of light beams. The disadvantages are: 1. The lens is thick and heavy, especially for high myopia above 1000 degrees. It reaches about 10mm; 2. The curved lens is not an ideal optical system, and it cannot form a perfect image, and there will inevitably be aberrations, which make the scene perceived by the human eye deviate from the reality

In reality, there are also patients with double vision defects who suffer from both myopia and presbyopia, and cannot see distant and near scenes clearly

If equipped with two sets of glasses for myopia and hyperopia, it is very inconvenient to carry and switch back and forth; ordinary positive and negative bifocal glasses integrating hyperopia and myopia correction functions have serious visual field defects, and the present invention aims to solve the above problems

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