Progressive Power Lens Group Intermediate Region Design
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Solution Overview
Problem
Progressive power lenses often require unnecessary body motion to adjust the line of sight for intermediate distances, leading to discomfort due to varying power changes at the intermediate region, even when the near power remains constant, causing astigmatism and discomfort.
Innovation Solution
A method for manufacturing progressive power lenses with a common near power and a predetermined power at the intermediate region, ensuring that the power change from the distance region to the near region is gradual, allowing for comfortable posture without changing the lens position when switching between lenses in the same group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the power change state at the intermediate region is varied to optimize for different wearers, then the visual comfort for specific individuals is improved, but the consistent posture requirement across different lenses in the same group is compromised
Solution Approach 1:
The patent applies parameter changes by systematically varying the power distribution in the intermediate region while maintaining fixed parameters (near power, distance power, and intermediate position) across all lenses in a group. This allows optimization for different visual needs while ensuring that the intermediate region remains at the same location, thereby maintaining posture consistency. The method involves adjusting the addition power gradient in the intermediate region without changing the fundamental lens structure or the position of the intermediate region.
2Ease of operation
If power is intentionally added to the distance region to suppress power increase and reduce astigmatism, then visual comfort is improved, but the intermediate region position for different lenses varies even with the same near power
Solution Approach 1:
The patent applies local quality by making the intermediate region the focus of precise power distribution control. Instead of uniformly adding power across the entire lens, the method specifically targets the intermediate region to optimize power progression while keeping other regions (distance and near regions) consistent. This localized approach allows astigmatism reduction through controlled power addition in the intermediate zone without affecting the positional consistency of the region across different lenses.
3Object-affected harmful factors
If the power progression from distance to near region is optimized, then astigmatism is reduced, but the intermediate region position shifts when lenses are replaced, requiring unnecessary body motion
Solution Approach 1:
The patent applies segmentation by dividing the lens into three distinct functional regions (distance region, intermediate region, and near region) with clearly defined boundaries and power characteristics. The intermediate region is segmented as a separate zone with controlled power progression, allowing independent optimization of astigmatism reduction while maintaining its position as a stable reference point. This segmentation enables the intermediate region to serve as a consistent anchor that does not shift when lenses are replaced, eliminating the need for body motion adjustments.
Data Source
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AI summary
Provided is a progressive power lens group including: a plurality of progressive power lenses (1) including a near region (11) for seeing an object at a near distance, a specific region (12) for seeing an object at a far distance in relation to the near distance, and an intermediate region (13) provided as a region between the specif ic region (12) and the near region (11) and having a power progressing from the specific region (12) toward the near region (11), in which a near power at the near region (11) is common in the plurality of progressive power lenses (1) and a power corresponding to a predetermined common target distance which is a distance between the near distance and the far distance is provided at a predetermined part of the intermediate region (13).