Spectacle Lens Optimization via Individual Eye Model Wavefronts
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Solution Overview
Problem
Conventional spectacle lens manufacturing methods cannot achieve complete correction of refractive errors for all viewing directions simultaneously, resulting in significant aberrations in peripheral areas, while optimizing for central vision.
Innovation Solution
A computer-implemented method that calculates and optimizes spectacle lens surfaces by considering individual eye models, including the topography of the cornea and refractive properties, to minimize aberrations across all viewing directions, using a detailed wavefront calculation and optimization process that accounts for higher-order aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional spectacle lens manufacturing methods optimize for central viewing zones, then central vision correction is improved, but peripheral aberrations increase significantly
Solution Approach 1:
The patent applies local quality by allowing different parts of the spectacle lens to have different optimization characteristics. The objective function assigns different weights to central and peripheral viewing zones, enabling the lens to provide precise correction in the central area while accepting higher aberrations in peripheral areas, matching the actual usage patterns of the eye.
Solution Approach 2:
The patent changes the parameters of the optimization process by incorporating higher-order aberration terms into the objective function and using individual eye models with specific anatomical parameters. This allows the lens design to account for and correct higher-order aberrations that conventional methods ignore, improving both central and peripheral vision quality.
2Adaptability or versatility
If complete correction for all viewing directions is attempted simultaneously, then comprehensive vision correction is improved, but manufacturing complexity increases significantly
Solution Approach 1:
The patent applies partial action by focusing the optimization on the most important viewing directions and zones rather than attempting equal correction for all possible directions. The objective function prioritizes central and intermediate zones with higher weights, providing sufficient correction for practical usage without the excessive complexity of perfect omnidirectional correction.
Solution Approach 2:
The patent replaces complex mechanical lens designs with computational optimization methods. By using computer-based objective functions and iterative optimization algorithms, the system achieves comprehensive vision correction through mathematical modeling rather than relying on complex mechanical lens structures, thereby reducing manufacturing complexity while maintaining adaptability.
3Measurement precision
If higher-order aberrations are included in the optimization process, then individual fitting precision is improved, but calculation complexity increases
Solution Approach 1:
The patent extracts and separates higher-order aberration terms from the overall wavefront error and treats them as distinct components in the objective function. By isolating these higher-order terms (such as coma, trefoil, and spherical aberration) and optimizing them separately with appropriate weighting, the system achieves individualized precision without overwhelming calculation 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
This approach leads to a more precise and adaptive spectacle lens design that better corrects refractive errors across all visual fields, improving the fitting accuracy and reducing peripheral aberrations, thus enhancing visual performance.
Implementation Method 1
spectacle lenses are manufactured to achieve the best possible correction of the refractive error of the wearer's eye
Data Source
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AI summary
Computer-implemented method for calculating or optimizing a spectacle lens for at least one eye of a spectacle wearer comprising the steps of: - Acquiring refractive data of the eye (12), comprising measuring the refractive data using light of a measurement wavelength;- Defining an individual eye model that defines at least the topography of an anterior corneal surface (18) of the eye (12), the position and action of a lens (20) of the eye (12), and a retinal position (LA) of the eye (12) such that the eye (12) exhibits the recorded refractive data, wherein defining the individual eye model includes defining a plurality of refractive surfaces as interfaces between a plurality of elements of the model eye with different refractive indices, defining a wavelength dependence of the elements of the individual eye model, and determining a geometry of the elements such that the eye of the eye model exhibits the measured refractive data at the defined wavelength dependence and at the measurement wavelength; - Specifying a first or second surface for the spectacle lens; - Determining the path of a principal ray (10) through at least one viewing point (i) of at least one surface (14;16) of the spectacle lens; - specifying a spherical wavefront (w0) incident on the first surface (14) of the spectacle lens along the principal ray (10); - determining a wavefront (we) in the at least one eye resulting from the spherical wavefront in a neighborhood of the principal ray through the action of at least the first and second surfaces of the spectacle lens, the anterior corneal surface (18) and the lens of the at least one eye; - iteratively varying the at least one surface (14; 16) of the spectacle lens to be calculated or optimized until an aberration of the resulting wavefront corresponds to a specified target aberration.;