Progressive Lens Gaze-Shift Measurement Across Near and Far Viewing
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Solution Overview
Problem
Existing methods for designing progressive power lenses fail to accurately capture the behavioral patterns during gaze shifting, particularly when a user switches between near and far vision, leading to dissatisfaction due to difficulties in focusing.
Innovation Solution
A method and device that dynamically change the viewing distance and display position of optotypes to replicate real-life gaze shifting, measuring behavioral patterns by repeatedly exposing subjects to different viewing states and capturing subjective reactions, head, and eyeball movements to quantify refocusing ability and proficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods are used to design progressive power lenses, then the lens design process is simplified, but the accuracy of capturing behavioral patterns during gaze shifting deteriorates
Solution Approach 1:
The measurement system is segmented into multiple independent display units arranged at different distances from the subject. Each display unit can independently present optotypes at specific viewing distances, allowing the system to capture behavioral patterns across multiple depth zones simultaneously. This segmentation enables precise measurement of gaze shifting behavior between near and far vision without requiring a single complex measurement apparatus.
Solution Approach 2:
The system transitions from a single viewing distance measurement to a multi-dimensional measurement space by arranging display units at different distances. This creates a spatial dimension for measurement that captures the subject's behavioral patterns across various viewing distances, enabling accurate assessment of refocusing ability and gaze shifting behavior that cannot be achieved in a single-plane measurement system.
2Measurement precision
If the subject views optotypes at multiple different distances, then the measurement of behavioral patterns during gaze shifting is improved, but the time required for measurement increases
Solution Approach 1:
The system pre-arranges multiple display units at different distances before the measurement begins. The subject is presented with optotypes at various viewing distances in a predetermined sequence, allowing the system to capture behavioral patterns across multiple depth zones without requiring the subject to physically move between distances. This preliminary arrangement of measurement conditions enables efficient multi-distance measurement within a single testing session.
Solution Approach 2:
The measurement process uses periodic presentation of optotypes at different distances in a structured sequence. The system alternates between displaying optotypes at near and far distances in a rhythmic pattern, allowing the subject to naturally shift gaze between distances while the system captures behavioral data. This periodic stimulation enables comprehensive measurement of refocusing behavior and gaze shifting patterns without requiring excessive measurement time.
Data Source
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AI summary
There is provided a method for measuring a behavioral pattern during gaze shifting, the method including: displaying an optotype on at least one of multiple display units arranged at different distances from a subject wearing a progressive power lens, and allowing the subject to view the optotype; and obtaining a subjective reaction from the subject who views the optotype, wherein by repeating the viewing the optotype and the obtaining the subjective reaction for multiple optotypes, the subject is allowed to experience two or more different viewing states, and a change in subject's behavior between the viewing states are measured.