Individual Eye Model Spectacle Lens Optimization
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Solution Overview
Problem
Current methods for manufacturing spectacle lenses cannot achieve full correction for all directions of sight simultaneously, resulting in significant aberrations in peripheral zones, and rely on simplified models that do not account for individual eye anatomy or refractive indices.
Innovation Solution
A computer-implemented method that uses individual refraction data and an individual eye model to optimize spectacle lens design, incorporating higher-order aberrations and specific optical properties of the eye, allowing for iterative adjustment of lens surfaces to minimize aberrations and improve adaptation to the wearer's visual needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a spectacle lens is optimized for full correction in central visual zones, then visual correction quality is improved, but aberrations in peripheral zones increase
Solution Approach 1:
The patent applies local quality by differentiating the optimization criteria for different zones of the spectacle lens. The target function assigns different weighting factors to central and peripheral zones, allowing the lens design to prioritize correction quality in central zones while accepting higher aberrations in peripheral zones, thus resolving the contradiction between central correction and peripheral aberrations
2Measurement precision
If an individual eye model with detailed anatomical parameters is used, then adaptation precision is improved, but device complexity increases
Solution Approach 1:
The patent uses a simplified copy or representation of the individual eye model that captures the essential anatomical parameters needed for lens optimization without requiring complete detailed anatomy. The target function uses key parameters like corneal curvature and axial length to represent the individual eye characteristics, achieving good adaptation precision while avoiding the complexity of complete anatomical modeling
3Manufacturing precision
If iterative optimization with individual measurement data is performed, then lens adaptation quality is improved, but calculation time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing target specifications and weighting factors in the target function before the actual lens optimization process. The individual measurement data is integrated into pre-defined optimization frameworks, allowing rapid convergence without requiring extensive real-time iterative calculations, thus reducing calculation time while maintaining adaptation quality
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
This approach enables a more effective and individualized adaptation of spectacle lenses, reducing aberrations and improving visual correction with minimal effort, while maintaining rapid convergence in the optimization process without compromising accuracy.
Implementation Method 1
a shape of a corneal front surface of a model eye... are defined based on individual measurement values for the eye of a spectacle wearer and/or on standard values and/or based on the provided individual refraction data
Implementation Method 2
parameters of a lens of the model eye... are defined... such that the model eye has the individual refraction data provided
Data Source
AI summary
Optimizing and producing a lens by defining an individual eye model, in which a shape of a corneal front surface of a model eye, and a reference aberration at an evaluation surface within the model eye are defined based on individual measurement values for the lens wearer's eye, on standard values, or based on provided individual refraction data; specifying first and second surfaces for the lens to be optimized; determining the path of a main ray through a visual point a surface of the lens into the model eye up to the evaluation surface; evaluating an aberration of a wavefront propagating along the main ray and resulting from a spherical wavefront incident on the first surface of the lens at the evaluation surface in comparison to the reference aberration; and iteratively varying the surface of the lens until the evaluated aberration corresponds to a predetermined target aberration.