Spectacle Lens Design Residual Astigmatism Management
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Solution Overview
Problem
Existing spectacle ophthalmic lenses, particularly progressive lenses, often fail to adequately address residual astigmatism, leading to discomfort and adaptation issues for users, as they do not effectively link measured visual acuity values with astigmatism management.
Innovation Solution
A method is developed to customize spectacle lens design by defining a link between measured visual acuity values and residual astigmatism, optimizing the acuity/distortion compromise through the calculation or selection of lens design, which considers the maximum allowable residual astigmatism for specific gaze directions and visual acuity levels, using computer means to determine a personalized optical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If standard spectacle lens design is used, then manufacturing simplicity is maintained, but residual astigmatism management is insufficient leading to user discomfort
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting lens design parameters (astigmatism management, progression corridor, intermediate zone positioning) based on measured visual acuity values. The system modifies these parameters to optimize the balance between correcting residual astigmatism and maintaining user comfort, thereby resolving the contradiction between improved operational ease and acceptable design complexity.
Solution Approach 2:
The invention implements dynamics by making the lens design adaptable rather than fixed. The design parameters are dynamically adjusted according to individual visual acuity measurements, allowing the lens to adapt to different user needs. This dynamic approach enables the system to maintain simplicity in standard designs while providing customized optimization when needed, thus improving user comfort without consistently increasing complexity.
2Adaptability or versatility
If residual astigmatism is increased to allow for progression corridor, then lens design flexibility is improved, but visual acuity deteriorates
Solution Approach 1:
The patent uses parameter changes to dynamically adjust the balance between progression corridor width and astigmatism management. By modifying design parameters based on visual acuity measurements, the system optimizes the compromise between maintaining design flexibility for progression and preserving visual acuity quality, resolving the contradiction between adaptability and measurement precision.
Solution Approach 2:
The invention applies partial action by selectively managing residual astigmatism in specific zones rather than uniformly across the entire lens. The system allows controlled astigmatism in certain areas to enable progression corridor while maintaining higher visual acuity in critical viewing zones, thus achieving a balanced compromise between flexibility and precision.
3Measurement precision
If measured visual acuity values are used to customize lens design, then visual acuity improvement is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent implements parameter changes by using measured visual acuity values to adjust lens design parameters such as astigmatism management and progression corridor positioning. This allows the system to optimize visual acuity while maintaining manufacturing feasibility by adjusting parameters within practical manufacturing ranges, thus resolving the contradiction between measurement precision and ease of manufacture.
Solution Approach 2:
The invention applies feedback by using measured visual acuity values to guide lens design customization. The measured values provide feedback that informs the design parameters, creating a closed-loop system that optimizes visual acuity while maintaining manufacturing simplicity through data-driven design adjustments rather than complex custom manufacturing processes.
Data Source
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AI summary
A method for providing a spectacle ophthalmic lens to a wearer, the method comprising the following consecutive steps: measuring the visual acuity value(s), VA, of the eye(s) of the wearer or the binocular visual acuity value, VAbino, of both eyes of the wearer where the eye(s) of the wearer is (are) substantially free of low order aberrations or is (are) corrected of low order aberrations; calculating thanks to computer means a design of the spectacle ophthalmic lens or selecting a design in a spectacle ophthalmic lens design data base by adapting the management of residual astigmatism based on the measured visual acuity value(s) of the eye(s) of the wearer.