Optimized Visual Equipment via Virtual Wearer and 3D Environment Modeling
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Solution Overview
Problem
Current methods for designing ophthalmic lenses, such as using ergoramas, fail to decouple environment information from lens characteristics and wearer behavior, leading to sub-optimal designs and discomfort due to limited consideration of realistic 3D environments and postural efforts.
Innovation Solution
A method and device that create a virtual wearer model and a 3D environment model to optimize visual equipment by evaluating optical and postural performance, allowing for the computation of optimized ophthalmic lenses without relying on ergoramas, thus accounting for wearer-specific needs and environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ergoramas are used to determine lens characteristics, then lens optimization can be performed, but environment information and wearer behavior are coupled together leading to sub-optimal designs
Solution Approach 1:
The patent segments the traditional ergorama approach by separating environment information from wearer behavior information. Instead of using a single coupled ergorama function, the system uses independent 3D environment models and wearer model simulations to evaluate optical performance and postural effort separately, then combines them in the optimization process. This segmentation allows for more precise lens design by avoiding the implicit coupling present in traditional ergoramas.
Solution Approach 2:
The patent introduces a virtual wearer model as an intermediary between the 3D environment model and the lens optimization process. This virtual model simulates wearer behavior and postural effort in response to the environment, acting as a mediator that translates environmental information into optical performance evaluations without requiring direct coupling between environment and behavior parameters.
2Adaptability or versatility
If traditional ergorama methods are used, then lens computation can be performed, but realistic 3D environments and postural efforts are not considered
Solution Approach 1:
The patent transitions from the traditional 2D ergorama function to 3D environment modeling. Instead of using angular and distance parameters in a planar representation, the system models the actual three-dimensional spatial arrangement of objects and uses ray-tracing through the lens to evaluate optical performance in realistic 3D scenarios. This dimensional change enables consideration of postural effort and realistic viewing conditions.
Solution Approach 2:
The patent creates a virtual copy of the wearer (virtual wearer model) that replicates real wearer behavior and postural effort characteristics. This virtual model can be simulated in various 3D environments without requiring actual human subjects, allowing the system to evaluate lens performance across different scenarios while maintaining reliability through accurate replication of wearer characteristics.
3Loss of information
If ergoramas are used to associate object points with directions, then lens design information can be obtained, but cases where a single direction looks at several object points at different distances cannot be managed
Solution Approach 1:
The patent introduces dynamic evaluation of multiple object points at different distances along the same gaze direction. The system uses ray-tracing that can accommodate multiple fixation points in the visual field, allowing the virtual wearer to dynamically focus on different objects at varying distances while maintaining the same head and eye posture. This dynamic capability enables the lens optimization to handle complex viewing scenarios that static ergoramas cannot manage.
Data Source
AI summary
A method for determining at least one optimized visual equipment to be worn by a human wearer includes: obtaining a wearer model as a virtual model of the human wearer; obtaining a model of at least one environment for which the at least one optimized visual equipment is to be determined, the at least one environment comprising tridimensional positions of objects to be viewed by the wearer model; determining at least one evaluation function related to the visual equipment, as a function of at least optical performance of the visual equipment and postural performance of the wearer model in the model of the at least one environment; optimizing the at least one evaluation function, so as to determine the at least one optimized visual equipment.