Ophthalmic Lens Fitting Measurement Posture Stability
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Solution Overview
Problem
The accuracy of ophthalmic lens fitting is compromised due to individuals not maintaining their natural posture during measurement, leading to unsatisfactory adaptation of lenses to the wearer's needs.
Innovation Solution
A method involving placing the individual in their natural posture, displaying an adjustable visual target, and adjusting its position to align with their line of sight, allowing for accurate determination of fitting parameters by capturing images or manually marking the intersection of the line of sight with a lens surface, while monitoring and correcting posture to ensure alignment with the Frankfurt plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the individual is asked to maintain natural posture during measurement, then measurement accuracy improves, but the individual cannot maintain this posture consistently without visual or postural constraints
Solution Approach 1:
A visual target is introduced as an intermediary element that the individual can focus on. This mediator allows the individual to maintain natural posture while having a specific visual reference point, thereby ensuring both measurement accuracy and posture consistency without imposing direct postural constraints
Solution Approach 2:
The system provides visual feedback through the adjustable visual target, allowing the individual to see and adjust their line of sight. This feedback mechanism enables the individual to self-correct posture deviations while maintaining natural positioning, ensuring reliable and consistent measurements
2Stability of the object's composition
If visual constraints are imposed during measurement, then posture stability improves, but the natural posture assumption is disrupted
Solution Approach 1:
The visual target is made adjustable and movable, allowing dynamic adaptation to the individual's natural line of sight. This dynamic element enables posture stabilization without imposing fixed visual constraints, maintaining measurement precision while improving posture stability
Solution Approach 2:
The position and characteristics of the visual target are changed based on the individual's natural posture parameters. By adapting the visual constraint parameters to match natural posture, the system achieves posture stability without disrupting the natural position assumption
Data Source
AI summary
Disclosed is a method for measuring data for fitting an ophthalmic lens in a frame for a individual, including the following steps: a) placing the individual in a natural posture; b) displaying a visual target with adjustable position in the field of view of the individual; c) having the individual equipped with the frame adjust the position of the visual target in order to place it straight ahead from him; d) determining the intersection, with a surface representative of the lens once placed in the frame, of the line of sight of the individual looking at the visual target with its adjusted position and determining the data based on the intersection determined.