Personalized Progressive Lens Design via Distortion Sensitivity
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Solution Overview
Problem
Progressive addition lenses (PAL) often cause aberrations and distortions, leading to a reduced field of view and adaptation challenges for wearers, as existing customization methods do not adequately account for individual sensitivity to optical distortions, which can vary significantly among users.
Innovation Solution
A method using computer-based systems to determine a personalized lens design by measuring and analyzing optical distortion sensitivity data, assigning an optical distortion sensitivity index, and selecting a lens design that minimizes distortions based on the wearer's specific sensitivity, activity, and eye-head behavior, allowing for customization of lens geometry and dioptric power profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a hard design with high power gradient is chosen for eye movers, then the sharp vision field is improved, but the distortion increases
Solution Approach 1:
The patent applies local quality by customizing lens parameters specifically for eye movers in the peripheral zones. The method measures ocular rotation amplitude and uses this data to adjust power distribution and distortion characteristics in specific regions of the lens, rather than applying a uniform design across the entire lens surface.
Solution Approach 2:
The patent changes physical parameters of the lens design based on measured wearer characteristics. Specifically, it modifies power gradient, add power distribution, and distortion characteristics as functions of the measured ocular rotation amplitude, transforming a standardized lens into a customized solution that optimizes the balance between sharp vision and distortion reduction.
2Object-affected harmful factors
If a soft design with smooth power gradient is chosen for head movers, then the distortion is reduced, but the sharp vision field is compromised
Solution Approach 1:
The patent applies local quality by customizing lens parameters specifically for head movers. The method measures ocular rotation amplitude and uses this data to adjust power distribution and distortion characteristics in specific regions of the lens, optimizing the balance between smooth transitions and sharp vision for this user group.
Solution Approach 2:
The patent changes physical parameters of the lens design based on measured wearer characteristics. Specifically, it modifies power gradient, add power distribution, and distortion characteristics as functions of the measured ocular rotation amplitude, transforming a standardized lens into a customized solution that optimizes the balance between smooth transitions and sharp vision.
3Ease of manufacture
If standard progressive addition lenses are used, then the manufacturing is simplified, but the adaptation time increases due to individual sensitivity variations
Solution Approach 1:
The patent applies preliminary action by measuring the wearer's ocular rotation amplitude and determining personalized lens parameters before lens manufacturing begins. This pre-customization approach allows standard manufacturing processes to be used while incorporating individualized design parameters, thereby reducing adaptation time without significantly complicating the manufacturing workflow.
Solution Approach 2:
The patent introduces dynamics by making lens parameters adaptive to individual wearer characteristics. The system measures ocular rotation amplitude and dynamically adjusts power distribution, add power, and distortion characteristics to match the specific wearer, enabling customization while maintaining manufacturing efficiency through automated parameter calculation.
Data Source
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AI summary
Method, implemented by computer means, for determining a lens design of an optical lens adapted to a wearer, the method comprising: - a wearer parameter providing step, during which wearer parameters are provided, - a lens design determining step, during which the lens design of the optical lens adapted to the wearer is determined based at least on the wearer parameters, wherein the wearer parameters comprise at least optical distortion sensitivity data representative of the sensitivity of the wearer to optical distortions.