Concentric Annular Multi-Zone Lens for Myopia Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lens designs for retarding myopia progression are limited in effectiveness, as they either fail to maintain sufficient myopic defocus at the peripheral retina or compromise central visual performance, and do not adequately account for individual variations in peripheral refractive error, leading to suboptimal treatment outcomes.
Innovation Solution
A concentric annular multi-zone lens with correcting zones and defocusing zones, where the defocusing zones have a stepwise increase in power towards the periphery to compensate for diminishing myopic defocus in eyes with hyperopic peripheral refractive error, and the lens is customized based on individual relative peripheral refractive error measurements to ensure accurate compensation without impacting accommodation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dual-power lenses are used to generate myopic defocus, then myopia progression is retarded to some extent, but the effectiveness is limited to below 70% and insufficient myopic defocus is maintained at the peripheral retina
Solution Approach 1:
The lens applies different optical properties to different regions: the central zone provides refractive error correction while the peripheral zones provide myopic defocus. This local differentiation allows the lens to simultaneously address central visual acuity and peripheral myopia control, overcoming the limitation of conventional lenses that use uniform power distribution
Solution Approach 2:
The lens is divided into multiple concentric zones with alternating correcting and defocusing functions. This segmentation creates distinct optical regions that can independently perform their specific functions - central correcting zones maintain visual acuity while peripheral defocusing zones generate myopic defocus, thereby improving overall effectiveness beyond what single-power lenses can achieve
2Reliability
If myopic defocus is applied to the peripheral retina to inhibit ocular growth, then myopia progression is retarded, but central visual performance is compromised
Solution Approach 1:
The lens design assigns different optical qualities to different spatial locations: the central zone maintains standard refractive power for accurate distance vision, while the peripheral zones incorporate positive add power to generate myopic defocus. This local quality differentiation ensures that central visual performance is preserved while peripheral myopia control is enhanced
3Ease of manufacture
If lens designs do not account for individual variations in peripheral refractive error, then manufacturing is simplified, but treatment effectiveness is suboptimal
Solution Approach 1:
The lens design incorporates variable add powers in the peripheral zones that can be customized based on individual peripheral refractive error measurements. This dynamic adaptation allows the lens to be tailored to each patient's specific ocular characteristics, improving treatment effectiveness while maintaining a standardized manufacturing process for the base 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 effectively generates a larger amplitude of myopic defocus at the peripheral retina, thereby more effectively retarding myopia progression while maintaining accurate accommodation and minimizing central visual performance loss.
Implementation Method 1
The concentric annular multi-zone lens comprises: a plurality of correcting zones for forming a focused image on a retina of the human eye... a plurality of defocusing zones for forming images anterior to the retina so as to generate myopic defocus
Data Source
AI summary
Provided herein is concentric annular multi-zone lens for retarding myopia progression in a human eye. The lens comprises: a plurality of correcting zones for forming a focused image on a retina of the human eye so as to correct refractive error of the human eye, wherein the correcting zone having a similar refractive power; a plurality of defocusing zones for forming images anterior to the retina so as to generate myopic defocus; and a defocusing power increasing region, in which refractive powers of defocusing zones being increasingly relatively positive towards the periphery of the lens so as to generate larger amplitude of the myopic defocus at the periphery of the retina; wherein the plurality of correcting zones and the plurality of defocusing zones are alternated in the concentric annular multi-zone lens.