Progressive Lens Astigmatism Mode Selection by Prescription Power
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Solution Overview
Problem
Existing progressive addition lens designs do not account for selecting an appropriate mode of transmission astigmatism based on the wearer's prescription power, leading to inconsistent wearer satisfaction.
Innovation Solution
A method for designing progressive addition lenses that selects between AS-oriented and PW-oriented modes of transmission astigmatism based on the wearer's prescription power, ensuring optimal visual field and satisfaction by adjusting the amount of transmission astigmatism added to the near and intermediate portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission astigmatism is added to the near portion and intermediate portion, then visual field clarity is improved, but wearer satisfaction becomes inconsistent due to lack of mode selection
Solution Approach 1:
The patent applies parameter changes by switching between two distinct modes (AS-oriented mode and PW-oriented mode) that differ in their transmission astigmatism distribution patterns. The AS-oriented mode distributes astigmatism to expand the clear visual field range, while the PW-oriented mode distributes it to widen the near portion horizontal width and reduce skew distortion. This parameter switching resolves the contradiction by allowing optimal parameter selection for different wearer needs.
Solution Approach 2:
The patent introduces dynamics by making the transmission astigmatism distribution adaptive rather than fixed. The design system dynamically selects between AS-oriented and PW-oriented modes based on wearer characteristics or prescription parameters, enabling the lens to adapt its astigmatism distribution pattern to different users, thereby ensuring consistent wearer satisfaction across diverse populations.
2Area of stationary object
If AS-oriented mode is selected, then clear visual field range is expanded, but near portion horizontal width and skew distortion control are reduced
Solution Approach 1:
The patent makes the transmission astigmatism distribution dynamic by allowing switching between AS-oriented mode (which expands clear visual field range) and PW-oriented mode (which optimizes near portion horizontal width and reduces skew distortion). This dynamic selection enables the system to prioritize visual field clarity when needed while maintaining near portion usability when required, resolving the contradiction between these two competing objectives.
3Ease of operation
If PW-oriented mode is selected, then near portion horizontal width is increased and skew distortion is reduced, but clear visual field range is decreased
Solution Approach 1:
The patent resolves this contradiction by making the transmission astigmatism distribution dynamic through mode selection. When PW-oriented mode is selected, the system prioritizes near portion usability with increased horizontal width and reduced skew distortion. When AS-oriented mode is selected, it prioritizes clear visual field range. This dynamic adaptability allows the same lens design system to optimize for different objectives based on wearer needs.
4Device complexity
If a single transmission astigmatism distribution pattern is used, then design complexity is reduced, but adaptability to different wearers is limited
Solution Approach 1:
The patent applies segmentation by dividing the transmission astigmatism distribution into two distinct patterns (AS-oriented and PW-oriented modes). Rather than using a single complex adaptive algorithm, the design is segmented into discrete, manageable modes that can be selected based on wearer characteristics. This segmentation maintains relative design simplicity while significantly improving adaptability to different wearers.
Solution Approach 2:
The patent uses parameter changes by switching between two predefined transmission astigmatism distribution patterns with different characteristic parameters. The AS-oriented mode has parameters optimized for clear visual field expansion, while the PW-oriented mode has parameters optimized for near portion width and distortion control. This parameter-based approach provides wearer-specific optimization without requiring complex real-time adaptation mechanisms.
Data Source
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AI summary
Provided are a method for designing a progressive addition lens and the related technology, the progressive addition lens including a near portion for viewing a near distance, a distance portion for viewing a distance farther than the near distance, and an intermediate portion provided between the near portion and the distance portion and having a progressive refraction function, in which transmission astigmatism is added to the near portion and the intermediate portion out of the distance portion, the near portion, and the intermediate portion, the method including a mode selection step of determining, according to a prescription power, whether to select an AS-oriented mode in which the amount of transmission astigmatism to be added is set such that the amount of horizontal refractive power is larger than the amount of vertical refractive power, or select a PW-oriented mode in which the amount of transmission astigmatism to be added is set such that the amount of vertical refractive power is larger than the amount of horizontal refractive power.