Spectacle Lens Base Curve Calculation Method
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Solution Overview
Problem
Existing methods for determining base curve values for spectacle lenses are inadequate in selecting the most suitable base curve for given prescription data and as-worn data, especially with advancing individualization of spectacle lenses.
Innovation Solution
A computer-implemented method for determining base curve values that calculates the base curve value based on a continuous, non-constant functional relationship between prescription data and as-worn position data, allowing for the selection of the most suitable base curve for individual prescription and as-worn data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional base curve charts are used to select base curve values, then the selection process is simple and quick, but the accuracy and individualization of base curve selection is insufficient
Solution Approach 1:
The patent transforms the base curve selection from discrete chart-based values to continuous calculated values based on prescription parameters. The base curve value is determined through a functional relationship involving spherical power, cylindrical power, and other optical parameters, enabling precise individualization while maintaining computational simplicity.
Solution Approach 2:
The patent replaces the mechanical chart-lookup method with a computational calculation system. Instead of manually selecting from predefined base curve charts, the system automatically calculates the optimal base curve value using prescription data and a defined functional relationship, improving accuracy without significantly increasing complexity.
2Manufacturing precision
If base curve values are selected from discrete charts, then manufacturing is simplified, but imaging quality and fit optimization are limited
Solution Approach 1:
The patent introduces dynamic base curve values that can be precisely adjusted according to individual prescription requirements. Instead of fixed discrete values from charts, the base curve is calculated dynamically based on spherical power, cylindrical power, and other parameters, allowing continuous optimization of imaging quality and fit while maintaining manufacturing feasibility through computer-controlled lens fabrication.
3Reliability
If individualized base curve calculation is implemented, then imaging quality improves, but calculation complexity and data processing requirements increase
Solution Approach 1:
The patent uses a functional relationship that systematically processes prescription parameters (spherical power, cylindrical power, axis, etc.) to determine base curve values. This approach maintains calculation efficiency while improving imaging quality by considering multiple optical parameters in a structured manner rather than through complex iterative optimization.
Data Source
AI summary
A computer-implemented method of determining a base curve value representing a base curve for a front surface of a spectacle lens is disclosed. The method includes receiving individual prescription data and determining the base curve value for the front surface of the spectacle lens based on the prescription data. In particular, the base curve value is calculated from the received prescription data based on a functional relationship between one or more values included in the prescription data and the base curve value.