Customized Progressive Addition Lens Surface Calculation
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Solution Overview
Problem
Conventional progressive addition lenses often have design features such as peripheral design, inset, and corridor length that are not optimally suited to an individual's visual requirements, leading to suboptimal performance despite a suitable peripheral design.
Innovation Solution
A method for calculating a customized progressive addition surface that allows for individual customization of design features like the position of points of interest, progression length, and inset, using a combination of initial surface designs and isotropic functions to create a tailored optical surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional progressive addition lens design is selected from available designs, then the peripheral design may be suitable for the wearer, but other design features such as inset and corridor length cannot be optimized for the wearer's specific visual requirements
Solution Approach 1:
The patent applies parameter changes by modifying key design parameters (inset, corridor length, progression rate) of the progressive addition lens surface equation to match the wearer's specific visual requirements. The method changes parameters such as the position of the near vision zone, far vision zone, and intermediate corridor characteristics by adjusting coefficients in the surface equation, thereby customizing the lens without requiring a completely new design.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing multiple progressive addition lens surface designs with different parameter combinations in a database. When dispensing, the system preliminarily selects and combines appropriate designs based on the wearer's peripheral design preference and visual requirements, then performs final customization through parameter adjustment. This preliminary preparation reduces the complexity of real-time customization.
2Reliability
If a progressive addition lens design with suitable peripheral design is selected, then peripheral comfort is achieved, but design features like inset and corridor length are not optimal for the wearer's visual requirements
Solution Approach 1:
The patent applies segmentation by dividing the progressive addition lens surface into distinct functional zones (near vision zone, far vision zone, and intermediate corridor) and independently optimizing the parameters of each zone. The method segments the surface equation into multiple terms, each controlling specific zone characteristics, allowing independent adjustment of inset, corridor length, and progression rate while maintaining overall lens integrity.
Solution Approach 2:
The patent implements local quality by allowing different regions of the lens surface to have different optical properties and parameter optimizations. The near vision zone, far vision zone, and corridor can each have customized characteristics tailored to the wearer's specific visual requirements, rather than applying a uniform design across the entire lens surface.
3Ease of manufacture
If standard progressive addition lens designs are used, then manufacturing is simplified, but the lens cannot provide individualized customization for each wearer
Solution Approach 1:
The patent applies parameter changes by modifying key design parameters (inset, corridor length, progression rate) of the progressive addition lens surface equation to match the wearer's specific visual requirements. The method changes parameters such as the position of the near vision zone, far vision zone, and intermediate corridor characteristics by adjusting coefficients in the surface equation, thereby customizing the lens without requiring a completely new design.
Solution Approach 2:
The patent implements universality by creating a single versatile manufacturing method that can produce both standard and customized progressive addition lenses. The same surface equation framework and manufacturing process are used for all lenses, with only the parameter values needing to be adjusted for customization. This allows the manufacturing system to handle both off-the-shelf and bespoke lenses through a unified process.
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
A method for calculating a customized progressive addition surface S' ' ' of a progressive addition lens (PAL) made of a material having an optical index of n, the method, comprising at least the successive steps of : a) providing N initial progressive addition surfaces where N = 1, b) calculating N intermediate surfaces S'k by flattening each initial progressive addition surfaces Sk, c) calculating a transformed intermediate surface S' ', d) calculating the customized progressive addition surface S' ' ' by cambering the transformed intermediate surface S' '.