Personalized Progressive Lens Design via Physiological Optimization
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Solution Overview
Problem
Current progressive multifocal ophthalmic lenses lack full personalization to meet the unique physiological and visual needs of individual wearers, leading to suboptimal visual comfort and accommodation difficulties due to variations in head-eye behavior and visual-motor coordination parameters.
Innovation Solution
A method for determining a set of progressive multifocal ophthalmic lenses through optimization using weighted targets for wearer power and astigmatism, based on individual physiological parameters and a physiological-optometry model, which accounts for specific head and eye movements to tailor lens design to each wearer's needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard progressive multifocal lenses are used, then general visual correction is provided, but full personalization to individual physiological needs is not achieved
Solution Approach 1:
The patent applies parameter changes by systematically varying multiple lens design parameters including progression length, addition values, base curves, and optical center positions to create personalized lens designs that match individual wearer characteristics such as head-eye behavior patterns and visual-motor coordination parameters
Solution Approach 2:
The patent segments the lens design process into distinct optimization stages, separating the determination of progression length from the determination of power distribution, and further dividing the visual field into different zones (distance, intermediate, near) with specific optimization criteria for each zone
2Ease of operation
If lenses are optimized for average wearers, then manufacturing is simplified, but visual comfort for individual wearers is suboptimal
Solution Approach 1:
The patent applies preliminary action by pre-determining the progression length and other key parameters through measurements of the wearer's head-eye behavior and visual-motor coordination before the actual lens manufacturing process, allowing the customized lenses to be produced more efficiently
Solution Approach 2:
The patent changes multiple lens parameters simultaneously including progression length, addition values, base curves, and optical center positions to achieve both improved visual comfort and streamlined manufacturing through systematic parameter optimization
3Adaptability or versatility
If progression length is standardized, then lens families are easier to define, but accessibility to near-vision powers does not match individual viewing strategies
Solution Approach 1:
The patent applies preliminary action by measuring the wearer's head-eye behavior patterns and visual-motor coordination parameters before lens manufacturing to pre-determine the optimal progression length that matches the individual's viewing strategy and near-vision needs
Solution Approach 2:
The patent changes the progression length parameter based on individual wearer characteristics including head movement patterns, eye movement patterns, and preferred viewing distances, allowing customization of the power progression to match each wearer's unique visual behavior
Data Source
AI summary
A method for determining by optimization a set of progressive ophthalmic lenses for a given user for whom a near vision power addition (Addn) has been prescribed includes the following steps: measuring the user's near vision individual physiological parameters; determining an ergorama associating, on each lens, a target point in each look direction in worn conditions; determining a target power defect and a resulting target astigmatism for each direction of look under worn conditions, the target power defect and the resulting target astigmatism being determined from the user's measured physiological parameters; computing the power required for each lens for said ergorama by successive iterations to reach the target power defect and the target astigmatism for each look direction.