Eye and Head Movement Measurement for Ophthalmic Lens Customization
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Solution Overview
Problem
Existing methods for determining the relative amplitude of eye and head movements are imprecise, which affects the customization and comfort of progressive ophthalmic lenses.
Innovation Solution
A method involving a target list, reference and peripheral targets with auditory and visual components, where the individual gazes at different targets while head and eye movements are measured, improving precision by using distinguishable visual targets and white noise, and repeating measurements at various offset positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If known head/eye movement coordination tests are used, then the testing process can be completed, but the measurement precision is insufficient
Solution Approach 1:
The testing process is segmented into multiple distinct phases: reference target presentation, peripheral target presentation, and rotation measurement. Each phase collects specific data independently, allowing for more precise measurements while maintaining organizational clarity. The segmentation of visual targets into reference and peripheral types enables separate analysis of different movement components.
Solution Approach 2:
The patent introduces auditory targets as an additional dimension alongside visual targets. This dual-sensory approach (visual + auditory) enriches the measurement capability without significantly increasing procedural complexity. The auditory targets provide an alternative modality for assessing head and eye movement coordination, thereby improving measurement precision through multi-dimensional data collection.
2Measurement precision
If multiple measurements are taken at different offset positions, then measurement precision improves, but testing time increases
Solution Approach 1:
The testing procedure employs periodic presentation of targets at different offset positions around the reference target. Instead of continuous measurement, the system periodically presents targets at predetermined angular intervals (e.g., left, right, upper, lower positions). This periodic sampling approach achieves sufficient measurement precision while limiting total testing time, as the system only measures at critical intervals rather than continuously.
Solution Approach 2:
The reference target is presented and stabilized before peripheral targets are introduced. This preliminary establishment of a reference point allows subsequent measurements to be quickly taken relative to this fixed baseline, reducing the time needed for each measurement cycle. The preliminary positioning of the individual's head and eyes at the reference target creates a consistent starting point for all subsequent offset measurements.
Data Source
AI summary
Method for determining the relative amplitude of eye and head movements of an individual, comprising: —a target providing step during which a list of visual targets comprising at least two different visual targets is provided; —a reference positioning step; —a reference target providing step during which a reference target comprising a visual and auditory target is provided; —a reference target gazing step during which the individual gazes at the reference target; —a peripheral target providing step during which a peripheral target comprising a visual and auditory target is provided; —a peripheral target gazing step during which the individual gazes at the peripheral target; and, —a rotation measurement step during which the angle of rotation of the individual's head and the angle or rotation of the individual's eyes are measured.