Single Vision Lens Surface Optimization for Mass Production
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Solution Overview
Problem
Existing single vision ophthalmic lenses produced through mass production methods lack personalized optical performance and are unable to achieve the quality of prescription or surfaced series lenses, while personalized lenses are expensive and cannot meet market demand for high volumes.
Innovation Solution
A computer-implemented method for producing a finished single vision ophthalmic lens with a rotationally symmetrical surface, optimizing optical characteristics for both far and near vision using a mass production process, and a computer program product to determine a series of such lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mass production methods (casting or injection technology) are used to produce single vision lenses, then productivity and cost-effectiveness are improved, but optical performance deteriorates from poor to medium quality
Solution Approach 1:
The patent applies parameter changes by optimizing aspheric coefficients (Q1, Q2, Q3, Q4) of the lens surface to improve optical performance. By carefully selecting and adjusting these mathematical parameters that define the lens curvature, the invention achieves medium-to-good optical quality while maintaining mass production compatibility through rotationally symmetric design.
2Manufacturing precision
If personalized prescription or surfaced series lenses are produced, then optical performance is improved to high quality, but cost and complexity increase significantly
Solution Approach 1:
The patent resolves this contradiction by deliberately avoiding asymmetric personalized designs in favor of rotationally symmetric aspheric surfaces. This asymmetric decision (choosing symmetry over customization) simplifies manufacturing while maintaining optimized optical performance through computer-generated aspheric coefficients, achieving a balance between quality and producibility.
Solution Approach 2:
The invention uses computer-generated design data and digital models to define lens parameters before mass production. By creating a digital template with optimized aspheric coefficients that can be replicated across thousands of lenses, the system achieves consistent optical performance without the need for complex individual customization processes.
3Ease of manufacture
If aspheric lenses with rotationally symmetric surfaces are produced, then ease of manufacture is improved for mass production, but optical performance is limited to medium quality at best
Solution Approach 1:
The patent overcomes this limitation by introducing advanced parameter control through optimized aspheric coefficients (Q1, Q2, Q3, Q4) in the surface equation. These parameters allow precise control of the rotationally symmetric surface geometry to correct optical aberrations, transforming a simple manufacturable design into one with medium-to-good optical quality while remaining compatible with mass production techniques.
Data Source
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AI summary
This computer-implemented method for providing a finished single vision ophthalmic lens intended for a wearer, from a target lens having at least one complex surface, the finished lens having a rotationally symmetrical front surface, comprises: (a) providing wearer data or theoretical data; (b) defining targeted optical or geometrical characteristics along a predetermined path on the target lens, based on the wearer data or on the theoretical data; (c) determining the finished lens by: (c1) selecting an initial lens complying with the prescription data and having a rotationally symmetrical front surface and a predetermined curvature at a prescription reference point; (c2) defining a current lens as the initial lens; (c3) modifying a front surface definition of the current lens to reach the targeted optical or geometrical characteristics until an ending criterion is met; (d) providing the finished lens as the current lens.