Progressive Lens Wavefront Optimization for High-Order Aberration Correction
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Solution Overview
Problem
Conventional progressive lens designs typically ignore high-order aberrations (HOAs), leading to significant third-order aberrations like coma and trefoil within the progressive corridor and at the boundaries between central and peripheral regions, which degrade vision quality.
Innovation Solution
A method that modifies the target vergence distribution of progressive lenses by using scalar coefficients derived from eye aberrations, allowing current custom design tools to account for HOAs without directly combining them with lens aberrations, using techniques like Taylor series expansions or Fourier series to optimize lens design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional progressive lens designs are used, then the lens structure is simple and easy to manufacture, but high-order aberrations (coma, trefoil) are not corrected leading to degraded vision quality
Solution Approach 1:
The patent applies preliminary action by pre-compensating for high-order aberrations during the lens design phase. The design process incorporates wavefront aberration measurements and uses optimization algorithms to pre-adjust the lens surface geometry, creating a lens that automatically compensates for HOAs without requiring complex additional components during manufacturing or wear.
Solution Approach 2:
The patent implements parameter changes by modifying the lens surface parameters (curvature, asphericity) based on wavefront aberration data. The optimization process adjusts multiple surface parameters simultaneously to minimize the impact of high-order aberrations, transforming the lens design from a standard progressive format to a customized wavefront-optimized design.
2Manufacturing precision
If high-order aberrations are corrected through detailed wavefront optimization, then vision quality improves, but the design process becomes computationally intensive and complex
Solution Approach 1:
The patent applies segmentation by dividing the optimization process into distinct stages: (1) wavefront measurement and analysis, (2) initial lens design based on lower-order aberrations, (3) high-order aberration compensation through targeted parameter adjustments, and (4) final optimization. This segmented approach makes the complex design process more manageable and computationally efficient.
Solution Approach 2:
The patent uses an intermediary optimization algorithm that acts as a mediator between the measured wavefront aberrations and the final lens design. This algorithm translates complex wavefront data into specific lens surface parameter adjustments, simplifying the design process while maintaining high correction precision.
3Ease of manufacture
If standard progressive lens designs are used, then manufacturing is straightforward, but peripheral distortion and clear zone deviations are significant
Solution Approach 1:
The patent applies local quality by implementing region-specific optimization across different zones of the progressive lens. The design process separately optimizes parameters for the distance zone, intermediate zone, and near zone, allowing each region to have customized surface characteristics that minimize local aberrations and distortion while maintaining overall lens manufacturability.
Data Source
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Figure 2B
Figure 3A~3B
AI summary
A method for designing a progressive lens, the method includes obtaining a wavefront measurement of an eye, the wavefront measurement including information about second order aberrations of the eye and about higher order aberrations of the eye; determining an initial design for the progressive lens based on the wavefront measurement, the initial design including, for one or more points on the lens, information about second order aberrations of the progressive lens and higher order aberrations of the progressive lens, the initial design providing a target correction for the eye in the absence of the higher order aberrations of the eye; determining information about how changes in one or more higher order aberrations of the eye affect a second order correction for the aberrations of the eye based on information derived from the wavefront measurement; modifying the initial design of the progressive lens to provide a final progressive lens design, wherein the modification accounts for an expected variation of the correction from the target correction due to one or more higher order aberrations of the initial progressive lens design and the information about how changes in one or more higher order aberrations of the eye affect the second order correction for the aberrations of the eye; and outputting the final lens design.