Aspheric Vision Correction Lens with Controllable Peripheral Defocus
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Solution Overview
Problem
Existing vision correction lenses, including orthokeratology lenses and intraocular lenses, fail to provide effective and controllable peripheral defocus, leading to inadequate control of myopia growth in individuals.
Innovation Solution
A method for preparing an aspheric vision correction lens with controllable peripheral defocus is developed, where the refractive power distribution is tailored to create myopic defocus by measuring the shape of the retina and formulating a plan for refractive power distribution that increases peripheral refractive power relative to the central region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing vision correction lenses are used, then vision correction is provided, but peripheral defocus cannot be effectively controlled leading to inadequate myopia growth control
Solution Approach 1:
The lens implements different refractive powers in different regions: the central optical zone provides standard vision correction, while the peripheral region introduces myopic defocus. This local differentiation allows the lens to simultaneously correct central vision and control peripheral focus, thereby effectively retarding myopia growth without requiring a completely complex new lens design.
Solution Approach 2:
The lens is divided into distinct functional zones including a central optical zone for vision correction and a peripheral zone for myopic defocus control. This segmentation enables independent optimization of each zone's optical properties, achieving both vision correction and myopia control functions while maintaining a relatively simple overall lens structure.
2Reliability
If peripheral refractive power is increased to create myopic defocus, then myopia growth is retarded, but manufacturing precision requirements increase
Solution Approach 1:
The lens design specifies precise refractive power parameters for different zones, with the peripheral region having a controlled refractive power range (e.g., +0.50D to +4.00D relative to central power). By defining specific parameter ranges and using standardized manufacturing processes, the patent achieves the required manufacturing precision while maintaining effectiveness in retarding myopia growth.
3Adaptability or versatility
If custom refractive power distribution is implemented, then individualized myopia control is achieved, but device complexity increases
Solution Approach 1:
The lens allows customization of refractive power distribution in the peripheral zone while maintaining a standard central optical zone. This approach enables individualized myopia control by adjusting only the peripheral parameters based on each patient's specific needs, rather than redesigning the entire lens, thereby achieving adaptability without excessive complexity.
Solution Approach 2:
The lens design separates the central vision correction function from the peripheral myopia control function. This segmentation allows the central zone to remain standardized while the peripheral zone can be customized for individual patients, achieving personalization without requiring complete lens redesign and thus limiting the increase in device complexity.
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 aspheric vision correction lens effectively forms myopic peripheral defocus, preventing the increase in axial length of the eye and retarding myopic growth, thereby providing a custom and quantifiable solution for myopia control.
Implementation Method 1
the refractive power distribution is tailored to create myopic defocus by measuring the shape of the retina and formulating a plan for refractive power distribution
Data Source
AI summary
The present invention discloses a method for making an aspheric vision correction lens with controlled peripheral defocus. The present invention also discloses a vision correction lens worn outside the eye, an orthokeratology lens and an intraocular lens made according to the method. The present invention further discloses a diagnosis and treatment method that utilizes myopic peripheral defocus to control and retard myopia growth.