Reference Head Posture Determination via Eyelid Position Analysis
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Solution Overview
Problem
Existing methods for determining a subject's head posture are tedious, variable, and not easily reproducible, making it challenging for eye-care practitioners to obtain precise and reliable measurements for ophthalmic lens fitting and verification.
Innovation Solution
A method involving the subject moving their head up and down while maintaining gaze direction, with the reference head posture determined by analyzing eyelid movement or position, allowing for precise and reproducible measurements of head posture and distinctive frame heights, and aiding in the verification of ophthalmic lens mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If video recording and habitual posture analysis is used, then measurement precision is improved, but device complexity and time consumption increase
Solution Approach 1:
The patent extracts the essential measurement element (eyelid position) from the complex video recording system. By focusing only on eyelid position changes during head movement, the method eliminates the need for comprehensive video recording equipment and processing, achieving precise head posture determination with simpler means.
Solution Approach 2:
The patent replaces the mechanical/video recording system with a physiological indicator-based system. Instead of using cameras and video analysis to track head posture, the method uses natural eyelid position changes that occur during controlled head movement, substituting mechanical measurement with physiological response observation.
2Measurement precision
If video recording method is used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent extracts only the necessary observation (eyelid position) from the complex video recording process. The practitioner simply needs to observe eyelid position changes during head movement, eliminating the need to operate video recording equipment, manage files, and perform complex analysis, thereby greatly improving ease of operation.
3Reliability
If habitual head posture determination is used, then reliability is improved, but time consumption increases
Solution Approach 1:
The patent uses preliminary physiological preparation (natural eyelid response to head movement) to establish a reliable reference posture quickly. The eyelid position naturally indicates the reference head posture during controlled movement, eliminating the need for time-consuming video recording sessions and habitual posture analysis over extended periods.
Data Source
AI summary
Disclosed is a method for determining a subject's reference head posture, the method including: a) obtaining a movement or a position of at least one eyelid of the subject while he/she moves his/her head up and down starting from an initial head posture wherein he/she directs his/her gaze towards a predetermined direction, the subject keeping his/her gaze directed towards the predetermined direction during the motion of his/her head; and b) determining the reference head posture as a function of a movement or a position of at least one eyelid of the subject during the motion of his/her head at step a). Further disclosed is a method for measuring a distinctive height associated with a frame of a pair of spectacles worn by the subject, as well as a method for mounting and for verifying the mounting of an ophthalmic lens in a frame of a pair of spectacles.