Spectacle Lens Design for Binocular Vision Accommodation
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Solution Overview
Problem
Conventional progressive addition lenses are not suitable for binocular vision as they do not account for both eyes viewing an object with the same accommodation power, leading to discomfort and eye strain.
Innovation Solution
Designing a pair of spectacle lenses where the accommodation powers for the right and left eyes are matched by calculating and adjusting the lens powers at specific points to ensure equal accommodation requirements for binocular vision, with a focus on matching powers within a certain range and applying the design to partial areas to balance astigmatism suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lens design focuses on suppressing astigmatism and balancing average power, then lens optical quality is improved, but binocular vision comfort deteriorates due to unequal accommodation powers between right and left eyes
Solution Approach 1:
The patent applies asymmetry by intentionally creating asymmetric power distributions between right and left lenses. Specifically, when the distance power difference between eyes exceeds a threshold, the patent deliberately sets different average powers and astigmatism distributions for right and left lenses, breaking the conventional symmetric design approach to achieve equal accommodation powers in binocular vision
Solution Approach 2:
The patent changes key optical parameters (average power and astigmatism distribution) based on the distance power difference between eyes. By dynamically adjusting these parameters according to the specific prescription requirements, the patent achieves accommodation power equality while maintaining astigmatism suppression within acceptable ranges
2Ease of operation
If lens powers are set to achieve equal accommodation powers for binocular vision, then binocular vision comfort is improved, but lens design complexity increases due to need for coordinated power distribution between both lenses
Solution Approach 1:
The patent applies preliminary action by pre-establishing judgment criteria and design rules before actual lens design. The patent sets threshold values for distance power difference and predefined adjustment strategies, allowing optometrists to quickly determine whether asymmetric design is needed and how to adjust parameters, thereby reducing design complexity
Solution Approach 2:
The patent segments the lens design process into distinct decision stages: first judging whether the distance power difference exceeds the threshold, then separately adjusting average power and astigmatism distribution based on the judgment result. This segmentation simplifies the overall design complexity by breaking down the complex binocular coordination problem into manageable steps
Data Source
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AI summary
There is provided a spectacle lens, which is a pair of spectacle lenses including a lens 1 for a left eye and a lens 2 for a right eye corresponding to left and right eyes respectively, wherein a lens power is set so that accommodation powers coincide with each other between right and left eyes, the accommodation powers being required for each of the right and left eyes calculated based on a distance between an arbitrary point on a virtual object surface and each of the right and left eyes, and the lens power at each passing point where an optical ray directed to this point passes through the lens 1 for a left eye and the lens 2 for a right eye, when the previously set arbitrary point on the virtual object surface is viewed in a binocular vision through the lens 1 for a left eye and the lens 2 for a right eye.