Optical Lens Mosaic Elements for Myopia Defocus Control
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Solution Overview
Problem
Conventional single vision optical lenses fail to correct focusing defects in children, leading to inaccurate near vision and potential progression of myopia, as they do not adequately address peripheral vision needs.
Innovation Solution
An optical lens with multiple contiguous optical elements, each having a specific dimension and optical power relationship, designed to minimize focusing on the retina and distribute light rays to other focal points, thereby slowing down the progression of abnormal refractions like myopia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single vision optical lenses are used to correct far vision, then the prescribed refractive power is provided, but the image of close objects is formed behind the retina causing focusing defects and myopia progression
Solution Approach 1:
The lens is divided into multiple contiguous optical elements with different optical powers. These elements are arranged in a mosaic pattern across the lens surface, with each element having a specific optical power that varies according to its position. This segmentation allows different regions of the lens to provide different optical functions, correcting both distance and near vision while controlling myopia progression.
Solution Approach 2:
Different regions of the lens are assigned different optical powers tailored to their specific functions. The central region provides distance correction, while peripheral regions provide near vision support and myopia control. Each optical element's power is locally optimized based on its position and the visual requirements of that specific area, creating a non-uniform optical power distribution across the lens.
2Reliability
If strong defocusing of light behind the retina is applied in peripheral vision, then myopia progression may be controlled, but the Modulation Transfer Function decreases and image quality deteriorates
Solution Approach 1:
The lens is divided into multiple contiguous optical elements with different optical powers. These elements are arranged in a mosaic pattern across the lens surface, with each element having a specific optical power that varies according to its position. This segmentation allows different regions of the lens to provide different optical functions, correcting both distance and near vision while controlling myopia progression.
Solution Approach 2:
The optical power of individual elements is systematically varied based on their position and function. By changing the optical power parameter across different regions and elements, the lens achieves multiple objectives: distance correction in the center, near vision support in peripheral areas, and controlled defocusing for myopia management, all while maintaining adequate image quality.
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 effectively reduces the progression of myopia by ensuring that a majority of light rays focus away from the retina, maintaining prescribed refractive power while improving peripheral vision accuracy.
Implementation Method 1
each of the contiguous optical element verifies that |P| d²≤K with |P| the absolute value of a characteristic optical power of said optical element expressed in diopter
Data Source
AI summary
An optical lens intended to be worn in front of an eye of a wearer having at least one prescribed refractive power Px, the optical lens comprising two opposite optical faces and a plurality of contiguous optical elements at least part of the optical elements having an optical function of not focusing an image on the retina of the eye of the wearer so as to slow down the progression of the abnormal refraction of the eye, wherein: —over a pupil having at least a 4 mm diameter, one can measure in a plane corresponding to the at least one prescribed refractive power along at least one direction, a Modulation Transfer Function through the optical lens greater than 0.1 between 0 and 20 cyc/deg; —a majority of the light rays passing through the optical lens over said pupil pass through at least one of the plurality of optical elements, and—each of the contiguous optical element verifies that Formula (I) with d a characteristic dimension of the contour of said optical element in mm, |P| the absolute value of a characteristic optical power of said optical element expressed in diopter, and K a number greater or equal to 0.9 and smaller than or equal to 1.7.