Aspheric Lens Element for Myopia Control
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Solution Overview
Problem
Conventional ophthalmic lenses fail to effectively control or slow down the progression of myopia and hyperopia, particularly in children, as they do not adequately address near vision focusing defects, leading to increased myopia over time due to elongation of the eye when peripheral light is focused behind the retina.
Innovation Solution
A lens element with a refraction area and multiple optical elements, including non-spherical features, that produce a non-focusing effect on the retina, characterized by a standard deviation of sphere values of at least 0.4 dpt, which are strategically positioned to reduce myopia progression by altering light curvature and distribution across the lens, potentially with a coating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single vision optical lenses are used for far vision correction, then myopia correction is achieved, but near vision focusing accuracy deteriorates
Solution Approach 1:
The lens is divided into multiple functional zones: a central refraction area for distance correction and multiple peripheral optical elements (microlenses) for myopia control. Each zone performs a distinct optical function, allowing simultaneous distance correction and myopia progression prevention without compromising near vision.
Solution Approach 2:
Different regions of the lens have different optical properties. The central area provides standard refraction for distance vision, while peripheral regions contain optical elements with specific non-focusing properties (standard deviation of sphere values ≥0.4 dpt) that create controlled defocus in peripheral vision to prevent myopia progression.
2Reliability
If peripheral light is focused on the retina, then clear peripheral vision is achieved, but eye elongation and myopia progression occur
Solution Approach 1:
The patent converts the harmful effect of peripheral focusing into a beneficial myopia control mechanism. Optical elements with standard deviation of sphere values ≥0.4 dpt create controlled defocus in peripheral vision, which prevents eye elongation while maintaining useful peripheral vision. The harmful peripheral focusing is transformed into a therapeutic defocusing effect.
3Ease of manufacture
If conventional optical lenses are used, then manufacturing simplicity is maintained, but myopia control effectiveness is insufficient
Solution Approach 1:
The lens combines conventional optical materials with specialized optical elements (microlenses or aspheric elements) having specific non-spherical properties. These composite structures integrate traditional lens manufacturing with advanced optical control features, achieving effective myopia management while maintaining manufacturing feasibility through established techniques.
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 myopia progression by producing a non-spherical optical wave, reducing focalization on the retina, especially in peripheral zones, and enhancing myopia or hyperopia control through clinical studies demonstrating improved outcomes with highly aspheric optical elements.
Implementation Method 1
a refraction area having a refractive power based on a prescription for said eye of the wearer; and a plurality of n optical elements, at least one of the n optical elements having an optical function of not focusing an image on the retina
Data Source
AI summary
A lens element for a spectacle lens, a contact lens or an intraocular lens, intended to be worn by a wearer having a refraction area having a refractive power based on a prescription for said eye of the wearer and a plurality of n optical elements, at least one of the n optical elements having an optical function of not focusing an image on the retina of the eye of the wearer, the kth optical element being located in a domain defined by a closed contour, k being a positive integer equal or greater than 2 and smaller or equal to n, a coating layer may be deposited on the lens element, wherein, without taking the potential coating layer into account, the least one kth optical element presents as a standard deviation of sphere values of at least 0.4 dpt, where is defined as, H(xi, yi) mean optical curvature operator at position xi, yi of the kth optical element in its domain, being the mean of the mean optical curvatures over the whole domain of the kth optical element, being an integer of number all positions xi yi in the domain of the k-th optical element and being greater than 100.