Variable Progressive Lens Design via Isoastigmatism Interpolation
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Solution Overview
Problem
Current progressive spectacle lens designs fail to adequately respond to individual wearer needs due to limited customization options and complex design creation processes, often resulting in unsatisfactory performance in specific situations of wear.
Innovation Solution
A method for calculating and creating individual spectacle lens designs that tailors the lens to the wearer's preferences, main focuses of use, and frame data by specifying a principal line, target astigmatism values, and modifying the course of isoastigmatism lines through interpolation, allowing for the creation of various design variations from a starting design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard progressive lens designs are used with limited customization options, then manufacturing and logistics are simplified, but individual wearer needs and specific situations of wear cannot be adequately addressed
Solution Approach 1:
The design creation process is segmented into modular components: selecting from predefined astigmatism gradient options, choosing progression lengths, and specifying principal directions of sight. This modular approach allows customization without requiring complete design creation, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent applies parameter changes by allowing adjustment of specific design parameters (astigmatism gradient values, progression length, principal directions) while maintaining the overall design framework. This enables individualization of lens designs without creating entirely new designs, thus improving adaptability while controlling complexity.
2Adaptability or versatility
If multiple standard designs are developed for different applications, then specific visual tasks can be addressed, but the complexity of design creation and logistics increases significantly
Solution Approach 1:
A single versatile design creation system is provided that can generate designs for various visual tasks and applications by adjusting parameters rather than maintaining separate design libraries. This universal system improves productivity while maintaining the ability to address different visual tasks through parameter specification.
Solution Approach 2:
The design system is made dynamic and flexible, allowing real-time adjustment of design parameters based on individual wearer needs and applications. This dynamic approach replaces static multiple design libraries with a single adaptable system, improving efficiency while maintaining versatility.
3Manufacturing precision
If individual spectacle lens designs are calculated online with full customization, then wearer-specific optimization is achieved, but calculation time and processing complexity increase
Solution Approach 1:
Predefined astigmatism gradient options and design templates are prepared in advance, allowing the calculation process to start from pre-optimized bases rather than creating designs from scratch. This preliminary preparation maintains manufacturing precision while reducing calculation time for individualized designs.
Solution Approach 2:
The system uses template-based design creation where standardized design patterns are copied and adapted to individual specifications rather than performing complete optimization calculations for each case. This copying approach reduces calculation time while maintaining precision through parameter adjustment.
Data Source
AI summary
A method and apparatus for creating a progressive spectacle lens design by transforming a starting design. The starting design is defined to include specification of a principal line, specifications for target astigmatism values A(u=0,y) along the principal line, and specifications for the course of a base target isoastigmatism line, which is described by a one-dimensional function of the form uG(y)=ƒ(y). The method and apparatus transform the starting design by modifying the course of the base target isoastigmatism line uG(y)→u′G(y), and calculating the target astigmatism values A(u,y) of the spectacle lens design by an interpolation between the target astigmatism values A(u=0,y) on the principal line and the target astigmatism values A(u′G(y),y) on the modified base target isoastigmatism line. Furthermore, the method and apparatus are provided to create the spectacle lens for the wearer on the basis of the progressive spectacle lens design.