Contact Lens Optical Axis Offset for Myopia Control
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Solution Overview
Problem
Conventional contact lenses for myopia progression suppression require high additional power, leading to reduced light collection and subjective Quality of Vision (QOV) issues, especially when worn by infants, as they fail to maintain daily life functionality due to inadequate focus correction.
Innovation Solution
A contact lens design with an offset lens optical axis aligned with the line of sight, allowing for minimal additional power in the peripheral region to correct hyperopic focal error, reducing asymmetrical aberrations and maintaining QOV by ensuring proper focus alignment near the retina without excessive power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high additional power is used in conventional contact lenses to correct hyperopic focal error in the retinal peripheral region, then myopia progression suppression effect is improved, but light collection on the retina is reduced and Quality of Vision deteriorates
Solution Approach 1:
The contact lens applies different optical powers to different regions: the central region provides refractive correction power for myopia, while the peripheral region provides positive additional power to correct hyperopic focal error. This local differentiation allows the lens to address both central and peripheral focal errors independently, achieving myopia progression suppression while maintaining adequate light collection for central vision.
Solution Approach 2:
The optical part of the contact lens is divided into distinct functional zones: a central region for refractive correction and a peripheral region for hyperopic focal error correction. This segmentation enables each region to perform its specific function optimally without interfering with the other, resolving the contradiction between suppression effect and light collection.
2Reliability
If high additional power is set in the peripheral region to correct hyperopic focal error, then myopia progression suppression is improved, but asymmetrical aberrations increase and subjective Quality of Vision deteriorates
Solution Approach 1:
The contact lens intentionally introduces controlled asymmetry through the positioning member that offsets the lens optical axis from the lens geometric center. This asymmetric design aligns the optical axis with the line of sight, which compensates for and reduces asymmetrical aberrations generated by the peripheral additional power, thereby maintaining good subjective Quality of Vision while achieving myopia progression suppression.
3Ease of manufacture
If conventional contact lens structure is used with lens optical axis at geometric center, then manufacturing is simplified, but alignment with line of sight is poor causing QOV deterioration
Solution Approach 1:
The contact lens incorporates a positioning member that creates an offset between the lens geometric center and the lens optical axis. This asymmetric configuration ensures that when the lens is worn, the optical axis aligns with the wearer's line of sight, improving visual quality while the positioning member provides clear orientation markers for proper lens insertion.
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 design achieves effective myopia progression suppression with reduced additional power, maintaining good QOV and reducing wearer burden by aligning the lens optical axis with the line of sight, thus preventing excessive power usage and aberrations.
Implementation Method 1
a lens optical axis of the optical part is set offset from a lens geometric center to align with a line of sight of a human eye under the worn condition
Implementation Method 2
a positive additional power as compared to a power in the central region is set in a peripheral region of the optical part to correct a hyperopic focal error
Data Source
AI summary
The present invention provides a contact lens having novel myopia progression suppression capability, while enabling a good QOV to be obtained and ensuring myopia is kept from progressing. A contact lens having a refractive correction power for correcting myopia and myopic astigmatism set in a central region of an optical part, wherein a positive addition power in comparison with a power in the central region is set in a peripheral region of the optical part so that progression of the myopia or myopic astigmatism is suppressed, a positioning member is provided that specifies a circumferential position of the lens under a worn condition, and a lens optical axis of the optical part is set offset from a lens geometric center to align with a line of sight of a human eye under the worn condition produced by the positioning member.