Personalized Progressive Lens Design for Frame-Specific Vision Optimization
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Solution Overview
Problem
Current progressive multifocal ophthalmic lenses do not adequately optimize vision fields based on the chosen frame size and shape, leading to suboptimal dynamic and peripheral vision for individual wearers.
Innovation Solution
A method to determine a personalized progressive ophthalmic lens by measuring frame parameters and head-eye behavior, weighting these parameters, and using an ergorama to calculate power and astigmatism targets for each direction of viewing, ensuring optimal power and astigmatism distribution tailored to the wearer's frame choice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If progressive multifocal lenses are optimized based on average wearer characteristics, then general applicability is improved, but personalization for individual head-eye behavior and frame choices deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing multiple ergoramas corresponding to different frame types and head-eye behaviors before the actual lens determination process. This allows the system to quickly select and apply the most appropriate pre-prepared model without requiring complex real-time calculations, thus achieving both efficiency and personalization.
Solution Approach 2:
The patent utilizes parameter changes by varying key parameters such as head-eye behavior characteristics, frame dimensions, and viewing conditions to generate different ergorama models. By systematically changing these parameters and storing the results, the system can accurately match individual wearers with their optimal lens design without requiring exhaustive real-time optimization.
2Measurement precision
If lens optimization considers multiple wearer conditions and frame parameters, then personalization is improved, but computational complexity and determination time deteriorates
Solution Approach 1:
The patent significantly reduces computational complexity by performing the complex optimization calculations in advance and storing the results as pre-computed ergoramas. During actual lens determination, the system only needs to select the appropriate pre-computed model based on the wearer's frame and behavior characteristics, avoiding repeated complex calculations while maintaining high personalization accuracy.
Solution Approach 2:
The patent applies partial action by focusing optimization on the most critical parameters (head-eye behavior, frame geometry, viewing conditions) rather than attempting to optimize all possible variables. This selective approach achieves sufficient personalization accuracy while keeping the computational burden manageable through pre-computation.
3Adaptability or versatility
If all-purpose progressive lenses are designed, then versatility across different wearers is improved, but optimization for specific frame sizes and shapes deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the lens design space into multiple discrete ergorama models, each optimized for specific frame types and wearer characteristics. Instead of creating a single all-purpose lens, the system segments the solution into frame-specific categories (e.g., small frames, large frames, different geometries) and provides tailored optimization for each segment, thereby achieving both versatility and precision.
Solution Approach 2:
The patent achieves universality by creating a multi-functional determination system that can handle various frame types and wearer behaviors through a unified methodology. The system uses a common optimization framework that adapts to different conditions by selecting appropriate pre-computed ergoramas, making the solution universally applicable while maintaining frame-specific optimization.
Data Source
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AI summary
A method for the determination by optical optimization of a personalized progressive ophthalmic lens intended to be inserted into a frame chosen by a given wearer for whom a power addition has been prescribed in near vision, the method comprising the stages of: - determining at least one parameter representing the frame chosen by the wearer; - measuring parameters representing the wearer's head-eye behaviour; - weighting the parameters representing the wearer's head-eye behaviour with the parameter representing the frame chosen by the wearer; - determining power and resulting astigmatism defect targets for each direction of viewing under wearing conditions, the targets being associated with an individual merit function taking into account the weighted head-eye coordination parameters. The method allows the design of the lens to be adapted to the size and the shape of the frame chosen.