Progressive Lens Design Using Eye Movement Parameter Adjustment
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Solution Overview
Problem
Current progressive spectacle lens designs typically assume the wearer's eyes have only second-order aberrations, failing to account for higher-order aberrations, which can lead to suboptimal optical power distribution and astigmatic errors, and require complex optimization methods that may not result in physically achievable designs.
Innovation Solution
A computer-implemented method that translates and rotates the initial design of a progressive spectacle lens to minimize the deviation between the perceived and initial optical power distributions, using aberration information including higher-order aberrations, thereby compensating for individual eye aberrations through simple adjustments in fitting parameters without altering the lens surface shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex optimization methods are used to account for higher-order aberrations, then the optical power distribution accuracy is improved, but the device complexity and computational effort increase significantly
Solution Approach 1:
The patent transforms the complex optimization problem into a parameter identification problem by changing the approach from optimizing lens design parameters to identifying eye movement parameters (amplitude and phase) that describe how the wearer actually uses the lens. This parameter transformation simplifies the mathematical complexity while maintaining accuracy in accounting for higher-order aberrations.
Solution Approach 2:
The patent creates a simplified mathematical model (copy) of the complex optical system by representing the eye-lens interaction through amplitude and phase parameters of eye movements, rather than directly modeling all higher-order aberrations. This copying approach captures the essential behavior without requiring complex optimization computations.
2Ease of manufacture
If the initial lens design is translated and rotated to compensate for higher-order aberrations, then the manufacturing feasibility is maintained, but the optical power distribution deviation may not be fully minimized
Solution Approach 1:
The patent introduces dynamic parameters (amplitude and phase of eye movements) to describe the wearer's interaction with the lens, allowing the system to adapt to individual variations without changing the static lens design. This dynamic approach maintains manufacturing feasibility while improving optical performance through parameter customization.
Solution Approach 2:
The patent changes the approach from modifying lens geometry parameters to adjusting fitting parameters (translation and rotation) based on identified eye movement characteristics. This parameter change maintains the lens's physical manufacturability while tailoring the optical performance to individual wearers with higher-order aberrations.
Data Source
AI summary
The current disclosure is directed to a method for determining an improved design for a progressive spectacle lens. Further, there are provided a method for manufacturing a progressive spectacle lens, a system for determining an improved design for a progressive spectacle lens, a non-transitory computer program and a progressive spectacle lens.