Autofocusing Eyewear Using Pupil Tracking VOG
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Solution Overview
Problem
Current eyewear solutions for presbyopia and other accommodative dysfunctions require manual adjustment to focus on near and far objects, lacking an automatic continuous focus adjustment mechanism that can accurately determine the user's depth of gaze.
Innovation Solution
The implementation of a pupil tracking video-oculography (VOG) system in conjunction with a focus-tunable lens and a controller, using CMOS sensors and a diffuse illumination system to determine pupil location and adjust focal power automatically based on gaze depth, employing algorithms for precise pupil detection and calibration to map pupil coordinates to focal powers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual adjustment mechanisms are used for focus-tunable lenses, then the device structure is simpler, but the ease of operation deteriorates due to requiring constant manual intervention
Solution Approach 1:
The system uses video-oculography to automatically track pupil positions and determine gaze depth, enabling the lens to self-adjust focus without manual intervention. The pupil tracking VOG system continuously monitors eye movements and triggers automatic focal power changes based on detected gaze depth transitions.
Solution Approach 2:
The system implements a feedback loop where the VOG system continuously monitors pupil position, the controller processes this data to determine gaze depth, and the focus-tunable lens adjusts focal power accordingly. This closed-loop feedback mechanism enables automatic adaptation to changing viewing distances.
2Extent of automation
If automatic pupil tracking VOG system is implemented, then the extent of automation is improved, but the device complexity worsens due to additional sensors and processing requirements
Solution Approach 1:
The VOG system serves multiple functions: tracking pupil position for gaze depth determination, detecting eye movements for focus triggering, and providing data for calibration. The single VOG system performs detection, measurement, and control functions that would otherwise require separate subsystems.
Solution Approach 2:
The patent combines the pupil tracking VOG system, controller, and focus-tunable lens into an integrated eyewear device. The illumination system, sensors, and processing units are merged into a compact form factor suitable for glasses, reducing overall system complexity despite the advanced functionality.
3Productivity
If focus adjustment is made continuous and automatic, then the productivity is improved by eliminating manual switching time, but the loss of time worsens due to calibration and system initialization requirements
Solution Approach 1:
The system performs calibration beforehand to establish the relationship between pupil position and gaze depth for each user. During initial setup or periodic recalibration, the system maps pupil coordinates to focal powers, storing this data for rapid automatic adjustment during normal operation without requiring real-time computation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables automatic and continuous focus adjustment between near and far objects, improving user convenience and accuracy by leveraging video-oculography and focus-tunable lens technology to adapt focal power in real-time, suitable for various eye conditions and applications beyond traditional glasses.
Implementation Method 1
employing algorithms for precise pupil detection and calibration to map pupil coordinates to focal powers
Implementation Method 2
The implementation of a pupil tracking video-oculography (VOG) system in conjunction with a focus-tunable lens
Implementation Method 3
a focus-tunable lens and a controller to focus the lens based on the position of the pupils
Data Source
AI summary
Autofocusing eyewear for correcting eye accommodative dysfunctions includes a pupil tracking VOG (video-oculography) system to determine location of the pupils, a focus-tunable lens and a controller to focus the lens based on the position of the pupils.