Viewing Angle-Dependent Spectacle Lens Calculation
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Solution Overview
Problem
Existing methods for calculating and optimizing spectacle lenses do not adequately account for the varying astigmatic effects at different object distances, leading to suboptimal imaging properties for individuals with progressive vision needs.
Innovation Solution
A computer-implemented method that acquires prescription data for multiple object distances and uses an object distance model to optimize the spectacle lens surfaces, taking into account the dependency of refractive power and astigmatism on viewing angles, ensuring improved imaging by integrating prescription data as a function of object distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a spectacle lens is optimized using fixed prescription values for distance and near, then the manufacturing process is simplified, but the imaging properties deteriorate because the lens cannot adapt to intermediate object distances and viewing angles
Solution Approach 1:
The patent applies dynamics by transitioning from fixed prescription values to dynamic, viewing-angle-dependent prescription values. The calculation method determines prescription values that vary according to the viewing direction, allowing the lens optimization to adapt to different object distances and angles. This dynamic approach improves imaging properties across the entire visual field while maintaining a systematic calculation framework.
Solution Approach 2:
The patent implements parameter changes by modifying the prescription parameters (sphere, cylinder, axis) as functions of viewing angle and object distance. Instead of using constant prescription values, the method calculates how these parameters change across different visual directions, enabling the lens to be optimized for varying viewing conditions without requiring a completely complex manufacturing process.
2Adaptability or versatility
If prescription data is acquired for multiple object distances and viewing angles, then the adaptability of the spectacle lens improves, but the measurement and data acquisition process becomes more complex
Solution Approach 1:
The patent applies universality by developing a calculation method that handles multiple object distances and viewing angles within a single unified framework. The method determines viewing-angle-dependent prescription values that are valid across the entire visual field, eliminating the need for separate measurements for each specific viewing condition. This multi-functional approach improves adaptability while simplifying the overall data acquisition process.
Solution Approach 2:
The patent implements preliminary action by calculating the viewing-angle-dependent prescription values in advance during the lens design phase. Rather than requiring real-time adjustment or multiple separate measurements during fitting, the method pre-determines how prescription parameters should vary across different viewing directions, allowing the lens to be manufactured with built-in adaptability to all viewing conditions.
3Manufacturing precision
If the spectacle lens is optimized for distance vision only, then the manufacturing process is simplified, but the imaging properties for near and intermediate distances deteriorate
Solution Approach 1:
The patent applies local quality by optimizing different regions of the lens for different viewing conditions. The method determines that prescription parameters should vary locally across the visual field, with specific values for distance, near, and intermediate zones. This allows each region of the lens to be optimized for its specific function while maintaining a coherent overall design, improving near and intermediate imaging without excessive complexity.
Data Source
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AI summary
The invention relates in particular to a computer-implemented method for calculating or optimising a spectacle lens, comprising the following steps: acquiring prescription or refraction data A1(x, y) and V A12 of a spectacle wearer for at least two different object distances A1 1 and A1 2 (A1 1 ? A1 2 ) comprising data regarding the spherical power Sph v , the degree of astigmatism Zyl v and the astigmatism axis Achse v ; predetermining an object distance model AI(x, y), where AI is the object distance and (x, y) denote a visual site or a visual point of the spectacle lens in a predetermined or predeterminable viewing direction; predetermining a function P Ref = (A1), which describes the dependence of a power vector, formula (I), of the prescription on the object distance A1; determining the components of the power vector P Ref of the prescription in a plurality of visual sites (x, y) on the basis of the object distance model A1(x, y) and the acquired prescription data A1(x, y) and V A12 , calculating or optimising at least one area of the spectacle lens taking into account the determined components of the power vector P Ref of the prescription at the visual sites (x, y).