Myopia Control Lens With Peripheral Mean Sphere Gradient
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Solution Overview
Problem
Conventional single vision optical lenses fail to adequately correct near vision defects in myopic children, leading to increased progression of myopia over time due to inaccurate focusing of close objects behind the retina.
Innovation Solution
A lens element with optical elements configured to increase the mean sphere and/or cylinder from the center to the peripheral part, providing varying refractive powers to correct both far and near vision, and incorporating multifocal refractive micro-lenses with aspherical surfaces and diffractive structures to slow down the progression of abnormal refractions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single vision optical lenses are used to correct far vision, then far vision correction is achieved, but near vision focusing accuracy deteriorates
Solution Approach 1:
The lens is divided into different zones with different optical properties: a central zone for distance vision correction and a peripheral zone with optical elements that provide near vision support. This local differentiation allows the lens to address both distance and near vision needs simultaneously, resolving the contradiction between far vision correction and near vision focusing accuracy
Solution Approach 2:
The lens comprises multiple discrete optical elements (micro-lenses) arranged in the peripheral zone, each contributing to the overall near vision correction function. This segmentation allows the lens to provide targeted optical support for near vision without interfering with the central distance vision correction zone
2Reliability
If conventional single vision optical lenses are used, then far vision is corrected, but myopia progression accelerates
Solution Approach 1:
The peripheral optical elements are designed to create preliminary defocus effects that prevent the eye from developing excessive myopic refraction in the first place. By providing near vision support through the peripheral zone, the lens preemptively counteracts the accommodative lag that would otherwise lead to increased myopia progression over time
3Measurement precision
If optical elements with increasing mean sphere towards periphery are configured, then defocus control is improved, but lens complexity increases
Solution Approach 1:
The optical elements in the peripheral zone are configured with systematically varying parameters, specifically the mean sphere value that increases from the center toward the periphery. This parameter gradient allows precise control of defocus across different zones of the lens, achieving accurate near vision support while maintaining a systematic and manufacturable design
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lens element effectively slows down the progression of myopia or hyperopia by improving near vision correction and compensating for accommodative lag, while enhancing aesthetics and optical performance.
Implementation Method 1
having optical elements configured so that along at least one section of the lens the mean sphere of optical elements increases from a point of said section towards the peripheral part of said section allows increasing the defocus of the light rays in front the retina in case of myopia or behind the retina in case of hypermetropia
Implementation Method 2
incorporating multifocal refractive micro-lenses with aspherical surfaces and diffractive structures
Data Source
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AI summary
A lens element intended to be worn in front of an eye of a person comprising: - a refraction area having a refractive power based on a prescription for said eye of the person; and - a plurality of at least three optical elements wherein the optical elements are configured so that along at least one section of the lens the mean sphere of optical elements increases from a point of said section towards the peripheral part of said section.