Ophthalmic Lens Design for Dynamic Visual Exploration
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Solution Overview
Problem
Existing ophthalmic devices, such as progressive addition lenses, are not adequately adapted to an individual's dynamic visual exploration strategy, leading to discomfort and fatigue due to their failure to account for the full range of eye and head movements during tasks like driving or walking.
Innovation Solution
A method and system that assess the efficiency of a wearer's visual exploration strategy by recording and analyzing their eye and head movements during simulated tasks, using criteria like approximate entropy and Markov Chains, to determine an optimized optical design for the ophthalmic device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If progressive addition lenses are designed with standard zones for far-vision, near-vision and intermediate-vision, then the lens provides coverage for different viewing distances, but the transitions between zones generate aberrations causing blur and distortion
Solution Approach 1:
The patent applies local quality by customizing the lens zone configuration to match the individual wearer's specific visual exploration strategy. Instead of using standard progressive addition lens zones, the system identifies the wearer's actual fixation points, saccade patterns, and gaze trajectories to create personalized zones with optimized optical properties, reducing aberrations in the wearer's specific viewing paths while maintaining versatility across different tasks
2Device complexity
If ophthalmic devices are designed based on static zone analysis of visual exploration, then the design is simplified, but it fails to account for dynamic aspects like repeatability and stability of eye and head motions over time
Solution Approach 1:
The patent implements feedback by continuously monitoring and analyzing the wearer's actual eye movements, head motions, and gaze patterns during various tasks. The system uses this feedback to refine and update the personalized lens design, adjusting zone configurations and optical parameters to match the wearer's dynamic visual exploration strategy, thereby improving reliability and adaptability while maintaining manageable design complexity through automated analysis
3Device complexity
If the ophthalmic device does not account for the full visual exploration strategy including multiple saccades and intermediate spots, then the device design is simpler, but it causes fatigue and discomfort during tasks requiring frequent eye and head movements
Solution Approach 1:
The patent applies dynamics by creating a living, adaptive lens design that responds to the wearer's real-time visual exploration behavior. The system analyzes dynamic parameters such as saccade velocity, fixation duration, head movement trajectory, and the sequence of intermediate spots visited during tasks. This dynamic analysis enables the lens to be optimized for the wearer's specific movement patterns, reducing fatigue and discomfort while maintaining design simplicity through automated personalized configuration
Data Source
AI summary
A system and method for determining an adapted ophthalmic device for a wearer, the method including acquiring a set of parameters values relating to the wearer, determining at least a task to be performed by the wearer involving visual exploration, using a computing system, determining a value of a criterion assessing an efficiency of the wearer's visual exploration strategy for the task, and determining an optical design of an ophthalmic device to be worn by a wearer according to the determined value of the criterion.