Compensated Spectacle Lens Digital Twins for Dioptric Accuracy
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Solution Overview
Problem
Existing methods for calculating optical systems fail to ensure that the dioptric function of manufactured optical systems accurately matches the calculated optical systems, necessitating a concrete modifying step to achieve equivalence.
Innovation Solution
A method involving the combination of a compensated surface with a predefined digital twin of a spectacle lens, utilizing discrete z positions or mathematical descriptions of correction surfaces to optimize optical power errors, ensuring the dioptric function of the manufactured system matches the calculated system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing methods for calculating optical systems are used, then the calculation process is relatively simple, but the dioptric function of the manufactured optical system does not accurately match the calculated optical system
Solution Approach 1:
The method performs preliminary modification of the calculated optical system before manufacturing by determining a modifying surface that compensates for expected manufacturing deviations. This preliminary action ensures that the manufactured system's dioptric function matches the intended design, resolving the accuracy issue without requiring complex post-manufacturing adjustments.
Solution Approach 2:
The modifying surface acts as an intermediary element between the calculated optical system and the manufactured system. By introducing this intermediate modifying surface, the method bridges the gap between theoretical calculations and actual manufacturing, enabling accurate dioptric function transfer while maintaining a structured calculation approach.
2Manufacturing precision
If a modifying step is introduced to ensure dioptric function equivalence, then the accuracy of the manufactured system improves, but the manufacturing process becomes more complex
Solution Approach 1:
The method extracts the modification requirement from the overall manufacturing process by separately determining the modifying surface through dedicated calculation steps. This extraction allows the modification to be handled as a distinct computational task, simplifying the integration into the manufacturing workflow while ensuring dioptric function equivalence.
Solution Approach 2:
The method creates a modified version of the original optical system surfaces by applying the determining step to generate modifying surfaces. This copying approach with systematic modification ensures that the essential optical characteristics are preserved while achieving the required dioptric function equivalence, making the process more manageable.
3Measurement precision
If multiple calculation steps including optimization are performed, then the optical power error is reduced, but the calculation time increases
Solution Approach 1:
The method applies optimization to reduce optical power error but allows for selective application based on requirements. The determining step can be applied partially or iteratively, enabling the system to achieve sufficient accuracy without always performing exhaustive optimization, thus balancing precision with calculation time efficiency.
Solution Approach 2:
The method incorporates feedback mechanisms where the calculated modifying surfaces are evaluated for their effect on optical power error. This feedback loop allows the system to adjust the optimization process dynamically, reducing unnecessary calculations while ensuring that optical power error is reduced to acceptable levels, thereby minimizing calculation time.
Data Source
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AI summary
The invention discloses a method being configured for calculating by a computer a compensated digital twin of a spectacle lens for the purpose of a use of the compensated digital twin for a manufacture of the spectacle lens, said compensated digital twin being based on a predefined digital twin of a spectacle lens, the method is characterized in the step of: - combining a compensated surface of a predefined digital twin of a spectacle lens with a respective other surface of said predefined digital twin resulting in said compensated digital twin.