Progressive Lens Design Parameter Transformation
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Solution Overview
Problem
Current methods for calculating progressive spectacle lens designs are inflexible and unable to adequately respond to individual wearer situations, often requiring customers to choose from limited designs that do not fully accommodate their specific needs or usage preferences.
Innovation Solution
A computer-implemented method for calculating a progressive spectacle lens design that involves transforming a starting design by shifting control points and modifying the base target isoastigmatism line to create a tailored astigmatism distribution, allowing for customization based on individual preferences and usage patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard progressive lens designs are used, then manufacturing and logistics are simplified, but individual wearer needs and preferences cannot be adequately met
Solution Approach 1:
The patent applies parameter changes by systematically varying key design parameters including progression length, progression shape, distance zone width, and near zone width to create multiple design variants from a base design. This allows customization to individual wearer needs while maintaining a structured approach that manages complexity through parameterization rather than complete redesign.
Solution Approach 2:
The patent creates a universal design system where a single base design can be transformed into multiple variants suitable for different applications (computer work, driving, reading, etc.). This multi-functional approach allows one core design structure to serve multiple purposes through parameter modification, reducing the need for entirely separate designs for each application.
2Adaptability or versatility
If multiple standard designs are offered for different applications, then specific usage scenarios can be addressed, but the complexity of design creation and logistics increases
Solution Approach 1:
The patent establishes a universal base design that can be adapted to multiple usage scenarios through parameter transformation. Instead of maintaining separate designs for computer work, driving, reading, and other applications, the system uses one core design structure that can be customized for any scenario, significantly reducing the number of designs that need to be created and managed.
Solution Approach 2:
The patent systematically modifies parameters such as progression length, distance zone width, and near zone width to create application-specific variants from a single base design. This parameter-based approach allows the same design framework to serve multiple functions without requiring separate design creations for each usage scenario.
3Manufacturing precision
If custom designs are created for each individual wearer, then optimal optical performance is achieved, but the calculation and production time increases
Solution Approach 1:
The patent performs preliminary actions by creating a base design that is pre-optimized with standard parameter relationships. When customization is needed, the system transforms this pre-prepared base design through parameter adjustments rather than creating a completely new design from scratch. This significantly reduces calculation time while maintaining optimization quality.
Solution Approach 2:
The patent uses parameter changes to efficiently generate customized designs by modifying key parameters of a base design. This approach maintains manufacturing precision by systematically adjusting parameters based on wearer needs while avoiding the time-consuming process of complete redesign, thus balancing optimization quality with calculation speed.
4Adaptability or versatility
If progression length is varied between designs, then different wearer preferences are accommodated, but the number of separate designs to manage increases
Solution Approach 1:
The patent treats progression length as a variable parameter that can be adjusted within a unified design framework. Instead of creating separate designs for different progression lengths, the system modifies this single parameter to generate variants, allowing progression length customization without proportionally increasing the number of separate designs to manage.
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 specifications for the course of a principal line and specification of at least one base target isoastigmatism line with a constant base target astigmatism, in which the base target isoastigmatism line passes through a first predetermined control point {right arrow over (r)}1=(u1,y1). The method and apparatus transform the starting design by shifting the first control point {right arrow over (r)}1=(u1,y1) along a predetermined or predeterminable curve, taking into account the design and/or the spectacle lens wearer-specific data; modifying the course of the base target isoastigmatism line such that it passes through the shifted first control point {right arrow over (r)}′1(u′1,y′1); and calculating a target astigmatism distribution A(u,y), which exhibits the modified base target isoastigmatism line. Furthermore, the method and apparatus are provided to create the spectacle lens on the basis of the progressive spectacle lens design.