Spectacle Lens Hard-Coat Thickness Control for Personalized Defocus
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Solution Overview
Problem
Existing myopia progression suppressing lenses require costly and time-consuming die modifications to accommodate individual wearer needs, particularly in children, due to varying near and distance vision requirements and power differences between eye portions.
Innovation Solution
The lens design incorporates a hard coat film that adjusts the degree of irregularities between convex regions and the base region from the lens center to the edge, using immersion and lifting techniques to apply the film, allowing for personalized wearer adjustments without die changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If injection molding with customized die is used to accommodate individual wearer needs, then adaptability to different vision requirements is improved, but manufacturing cost and time increase significantly
Solution Approach 1:
The lens is divided into multiple convex regions with different defocus powers, where each region can be independently controlled through the hard coat film thickness. This segmentation allows the lens to accommodate different vision requirements (distance vision, near vision, intermediate vision) in different areas without requiring multiple custom dies.
Solution Approach 2:
Different regions of the lens are given different optical properties through varying hard coat film thickness. The central region has different defocus power compared to peripheral regions, allowing each area to serve specific vision needs. This local differentiation achieves customization without modifying the base lens structure or die.
Solution Approach 3:
The defocus power of convex regions is adjusted by changing the hard coat film thickness parameter. By controlling the film thickness during the dip coating process, the optical power of each convex region can be precisely tuned to match individual wearer requirements, providing adaptability without die modifications.
2Adaptability or versatility
If multiple convex regions with different shapes are formed in the die, then individual wearer needs are accommodated, but die design complexity and cost increase
Solution Approach 1:
A single standardized die design with uniform convex regions can serve multiple wearers with different vision requirements. The universality is achieved by controlling the hard coat film thickness to create different defocus powers from the same base lens structure, eliminating the need for multiple specialized dies.
Solution Approach 2:
The hard coat film acts as an intermediary layer that modifies the optical properties of the base lens. By adjusting the film thickness, different defocus powers are created without changing the underlying lens substrate or die design, simplifying the die complexity while maintaining adaptability.
3Ease of manufacture
If uniform hard coat film thickness is applied, then manufacturing simplicity is maintained, but ability to control defocus power in different regions is reduced
Solution Approach 1:
The lifting speed during the dip coating process is dynamically varied to achieve different hard coat film thicknesses in different regions. By changing the lifting speed according to the desired defocus power distribution, the system maintains manufacturing simplicity while achieving precise control over regional optical properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables myopia progression suppression while reducing production costs and time, accommodating individual wearer needs through a hard coat film application process.
Implementation Method 1
a hard coat film that forms the base region so as to cover the substrate base portion and forms the defocus region so as to cover the plurality of substrate protrusions by covering the lens substrate including the plurality of substrate protrusions
Implementation Method 2
the convex regions of the spectacle lens exert refractive power according to their shapes. On the other hand, when divergent light is incident on the pupil from a position near the wearer of the spectacle lens, the convex regions of the spectacle lens exert only low refractive power
Data Source
Figure 1A~1B
Figure 2
Figure 3~4
AI summary
Provided are a spectacle lens and related technology thereof. The spectacle lens includes a functional region having a base region and a defocus region and achieves a myopia progression suppressing effect. The spectacle lens includes a lens substrate and a hard coat film. From a lens center toward an outer edge on at least one straight line passing through the lens center of the spectacle lens when the spectacle lens is viewed in plan facing the defocus region, a degree to which the hard coat film fills the lens substrate tends to increase and irregularities between convex regions and the base region tend to become smoother, or the degree to which the hard coat film fills the lens substrate tends to decrease and the irregularities between the convex regions and the base region tend to become steeper.