Contact Lens Spherical Aberration for Coma Management
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Solution Overview
Problem
Conventional contact lenses fail to effectively address residual irregular astigmatism caused by high-order aberrations, leading to poor quality of vision due to the complexity and impracticality of custom-made designs that offset specific high-order aberrations to zero, which often result in significant adverse effects from remaining aberrations.
Innovation Solution
A contact lens manufacturing method that sets spherical aberration corresponding to coma aberration in the user's eye, maintaining it to remain non-offset, using rotationally symmetrical optical characteristics around the optical axis, thereby reducing the adverse effect of coma aberration on quality of vision and simplifying design and manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a corrective lens is designed to offset high-order aberrations (such as coma aberration) to become zero, then the quality of vision (QOV) is improved, but the design and manufacturing complexity increases significantly making it impractical for mass production
Solution Approach 1:
The patent changes the optical parameter approach by not attempting to eliminate coma aberration completely, but instead introducing spherical aberration as a compensating parameter. The lens is designed with specific spherical aberration values (e.g., RMS 0.05-0.15μm) that, when combined with the eye's natural spherical aberration, create an optical system where the residual coma aberration has reduced impact on vision quality. This parameter substitution approach simplifies manufacturing while maintaining QOV improvement.
Solution Approach 2:
The patent addresses the asymmetry problem by designing a lens with rotationally symmetrical optical characteristics. Instead of attempting to correct the asymmetric coma aberration directly (which would require complex asymmetric lens surfaces), the invention uses symmetric spherical aberration to compensate for the asymmetric coma, thereby simplifying the lens design and manufacturing process while still improving vision quality.
2Ease of manufacture
If a corrective lens is designed to offset only specified high-order aberrations to achieve zero, then the manufacturing process is simplified, but the adverse effect on vision due to other residual high-order aberrations remains large
Solution Approach 1:
The patent converts the harmful effect of spherical aberration into a beneficial compensating mechanism. Rather than treating spherical aberration as an unwanted residual defect to be eliminated, the invention intentionally introduces controlled spherical aberration into the lens design. This spherical aberration interacts with the eye's optical system to reduce the impact of coma aberration, thereby converting what is traditionally considered a harmful optical defect into a useful corrective mechanism that improves overall vision quality.
3Ease of manufacture
If conventional corrective lenses are used with standard optical characteristics, then the manufacturing is simple and cost-effective, but they fail to address residual irregular astigmatism caused by high-order aberrations
Solution Approach 1:
The patent modifies the optical parameters of conventional contact lenses by intentionally designing them with specific spherical aberration characteristics. Standard contact lenses are designed to minimize all high-order aberrations, but this invention deliberately incorporates controlled spherical aberration (e.g., 4th order spherical aberration with specific RMS values) to compensate for coma aberration in the user's eye. This parameter modification maintains manufacturing simplicity while adding the functional capability to improve quality of vision by addressing residual irregular astigmatism.
Data Source
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AI summary
Provided is a contact lens having a novel structure with a high level of practicality which is easy to manufacture and apply to users, and can improve quality of vision (QOV). In an optical part (16) of a contact lens (10), a spherical aberration of a size corresponding to a coma aberration of a user's naked eye, and of a size for which a spherical aberration of the user's naked eye will not be offset and will be made to remain is set as a corrective optical characteristic for a residual irregular astigmatism of the user's naked eye. A high-order aberration of the optical part is set rotationally symmetric around an optical axis.