Progressive Power Lens Pair Asymmetric Allocation
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Solution Overview
Problem
Existing progressive power lens designs face challenges in minimizing the angle of deviation between left-eye and right-eye lenses, particularly when prescriptions differ, leading to increased processing steps and compromised optical performance.
Innovation Solution
A progressive power lens pair is designed with different allocation parameters for the left-eye and right-eye lenses, allowing for unequal surface additional powers and astigmatic powers, which are adjusted to optimize optical characteristics and minimize angle of deviation, while maintaining balanced refractive powers and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If slab-off processing is applied to minimize angle of deviation between left-eye and right-eye lenses, then the angle of deviation is reduced, but the number of processing steps increases and optical performance is compromised
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-adjusting the allocation parameters (surface additional power and astigmatic power) during the lens design phase. The difference in allocation parameters between left-eye and right-eye lenses is determined in advance based on prescription data, allowing the lenses to be manufactured directly with the correct optical characteristics without requiring subsequent slab-off processing to correct angle of deviation.
Solution Approach 2:
The patent employs parameter changes by varying the allocation parameters (surface additional power ADD1-ADD2 and astigmatic power) differently for left-eye and right-eye lenses. By adjusting these parameters according to the specific prescription and eye characteristics, the optical performance is optimized and angle of deviation is minimized while maintaining manufacturing simplicity.
2Manufacturing precision
If slab-off processing is applied to minimize angle of deviation between left-eye and right-eye lenses, then the angle of deviation is reduced, but optical performance is compromised
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-adjusting the allocation parameters (surface additional power and astigmatic power) during the lens design phase. The difference in allocation parameters between left-eye and right-eye lenses is determined in advance based on prescription data, allowing the lenses to be manufactured directly with the correct optical characteristics without requiring subsequent slab-off processing to correct angle of deviation.
Solution Approach 2:
The patent employs parameter changes by varying the allocation parameters (surface additional power ADD1-ADD2 and astigmatic power) differently for left-eye and right-eye lenses. By adjusting these parameters according to the specific prescription and eye characteristics, the optical performance is optimized and angle of deviation is minimized while maintaining manufacturing simplicity.
3Manufacturing precision
If different allocation parameters are used for left-eye and right-eye lenses, then optical characteristics are corrected and angle of deviation is reduced, but design complexity increases
Solution Approach 1:
The patent employs parameter changes by varying the allocation parameters (surface additional power ADD1-ADD2 and astigmatic power) differently for left-eye and right-eye lenses. By adjusting these parameters according to the specific prescription and eye characteristics, the optical performance is optimized and angle of deviation is minimized while maintaining manufacturing simplicity.
Solution Approach 2:
The patent applies feedback by using a determination device that automatically calculates the appropriate allocation parameters based on the prescription data and eye characteristics. This automated determination process provides feedback to guide the lens design and manufacturing, ensuring optimal optical performance without requiring complex manual calculations or adjustments.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
A progressive power lens pair is provided with an object-side surface and an eyeball-side surface of the right-eye lens and an object-side surface and an eyeball-side surface of the left-eye lens which are set by ensuring that ADDR1 - ADDR2 and ADDL1 - ADDL2 take values different from each other, with ADDR1 and ADDR2 respectively representing surface additional power at the object-side surface and surface additional power at the eyeball-side surface of the right-eye lens, and with ADDL1 and ADDL2 respectively representing surface additional power at the object-side surface and surface additional power at the eyeball-side surface of the left-eye lens, when prescribed additional power for the right-eye lens and prescribed additional power for the left-eye lens are equal to each other in the progressive power lens pair; and prescription information for the progressive power lens pair indicates: that spherical power SR at the right-eye lens and spherical power SL at the left-eye lens are different from each other, that astigmatic power CR at the right-eye lens and astigmatic power CL at the left-eye lens are different from each other, or that an astigmatism axis angle AxR corresponding to the right-eye lens and an astigmatism axis angle AxL corresponding to the left-eye lens are different from each other.