Spectacle Lens Digital Twin for Layered Power Distribution Control
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Solution Overview
Problem
Existing methods for calculating the construction data of spectacle lenses with non-uniform layer thickness and uniform refractive index profiles are inadequate for achieving precise optical path lengths and power distributions.
Innovation Solution
A computer-implemented method for calculating a digital twin of a spectacle lens with a predefined power distribution, involving a layer stack of individual layers with non-uniform thickness and uniform refractive index, which controls optical path lengths through spatial variation to achieve precise optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional methods are used to calculate construction data of spectacle lenses, then the manufacturing process can be completed, but the optical path lengths and power distribution precision are insufficient
Solution Approach 1:
The lens is divided into multiple layers with different refractive indices, where each layer has a uniform refractive index but non-uniform thickness. This segmentation allows precise control of optical path lengths by adjusting layer thicknesses rather than requiring complex refractive index gradients within single layers.
Solution Approach 2:
The invention changes the parameter approach from varying refractive indices continuously within layers to varying thicknesses of discrete layers with uniform refractive indices. This parameter transformation simplifies the calculation while maintaining precision in optical path length control.
2Measurement precision
If complex refractive index profiles are used to achieve precise power distribution, then optical performance improves, but computational complexity increases
Solution Approach 1:
The refractive index profile is segmented into discrete layers, each with a uniform refractive index. This segmentation transforms the complex continuous refractive index distribution into a manageable set of discrete parameters (layer thicknesses and refractive indices), reducing computational complexity while maintaining power distribution precision.
Solution Approach 2:
The invention changes from calculating continuous refractive index gradients to calculating discrete layer thicknesses. This parameter transformation simplifies the mathematics involved in computing optical path lengths and power distributions, reducing computational complexity while achieving the same optical performance.
3Manufacturing precision
If non-uniform refractive index profiles are implemented, then optical path length control improves, but manufacturing complexity increases
Solution Approach 1:
The invention changes the manufacturing approach from creating non-uniform refractive indices within layers to creating uniform refractive index layers with non-uniform thicknesses. This parameter reversal simplifies the manufacturing process because uniform refractive index materials are easier to produce than gradient-index materials, while still achieving precise optical path length control through thickness variation.
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 method ensures that the manufactured spectacle lens maintains the predefined power distribution with minimal deviation, enabling accurate optical performance and reducing computational complexity compared to traditional methods.
Implementation Method 1
determining the spatial variation of the layer thicknesses of the individual layers to achieve the predefined power distribution by a spatial control of optical path lengths
Data Source
AI summary
A computer-implemented method for calculating a digital twin of a spectacle lens is provided to use the digital twin for a manufacture of the spectacle lens. The digital twin has a predefined power distribution and contains a layer stack with a plurality of individual layers, each layer having a non-uniform layer thickness with a spatial variation and a uniform refractive index. The method includes determining the spatial variation of the layer thicknesses of the individual layers to achieve the predefined power distribution by a spatial control of optical path lengths.