Spectacle Lens Design via Fitting Point Displacement
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Solution Overview
Problem
Conventional methods for designing individual spectacle lenses are inadequate as they do not accurately convey the displacement of the fitting point, leading to a decrease in visual performance due to incorrect calculation of lens surfaces based on incomplete information provided to the manufacturer.
Innovation Solution
A method and system for designing spectacle lenses that involve obtaining displacement information between the user-specific fitting position and a reference position, allowing for accurate calculation of lens surfaces to optimize visual performance by accounting for the actual placement of the lens on the wearer's eye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to design individual spectacle lenses without displacement information, then the manufacturing process is simpler and faster, but the visual performance decreases due to incorrect calculation of lens surfaces
Solution Approach 1:
The patent applies preliminary action by obtaining displacement information about the fitting point position before the lens design and manufacturing process. This allows the lens surfaces to be pre-calculated with accurate positioning data, ensuring that when the lens is manufactured and fitted, the optical center aligns correctly with the wearer's pupil, thereby resolving the contradiction between manufacturing simplicity and visual performance accuracy.
2Reliability
If displacement information is obtained and used in lens design, then visual performance is improved through accurate lens surface calculation, but the process requires additional measurement steps and information collection
Solution Approach 1:
The patent applies self-service by using the existing spectacle frame and its inherent geometric features (such as reference marks, frame geometry, and fitting structures) to automatically determine the displacement information. The measurement system leverages the frame's own characteristics to extract positioning data without requiring separate external measurement devices or procedures, thereby reducing time loss while improving visual performance reliability.
3Measurement precision
If manual measurement methods are used to determine fitting parameters, then the equipment required is simpler, but the measurement precision is insufficient leading to incorrect lens positioning
Solution Approach 1:
The patent introduces an intermediary digital measurement and processing system that acts as a mediator between the physical spectacle frame and the lens design process. This intermediary system captures geometric data from the frame, processes it to extract precise displacement information, and transmits it to the lens design software. This approach maintains ease of manufacture by using accessible technology while achieving high measurement precision that manual methods cannot provide.
Data Source
AI summary
A method for designing, by means of a computer, at least one surface of a lens for a user. The method includes the steps of (i) obtaining displacement information on an amount of displacement between a user specific fitting position and a reference position, the reference position representing a primary fitting point of a lens surface on a reference line of sight of an eye of the user, and the user specific fitting position representing a user specific fitting point of the lens surface determined on the basis of the user; and (ii) causing calculating a design of the at least one surface of the lens on the basis of said displacement information.