Worn Eye-Tracking Device for Precise Pupillary Distance Measurement
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Solution Overview
Problem
Existing methods for determining anatomical parameters for designing and manufacturing glasses are inaccurate due to the use of external, non-embedded devices that remotely observe the subject's eye, leading to restrictive and imprecise measurements, particularly in determining half-pupillary distances which can differ between the left and right eyes.
Innovation Solution
A gaze tracking device worn by the subject, comprising optical sensors and a frame or mask with a positioning mark, allows direct and precise measurement of ophthalmological parameters like pupillary half-distances and center of rotation, using a stereoscopic system and embedded wireless technology compatible with standard computer systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If external non-embedded devices are used to remotely observe the subject's eye, then the measurement process can be performed without contact, but the measurement accuracy deteriorates due to the distance from the eye
Solution Approach 1:
The eye-tracking device is nested within a frame or mask that the subject wears, placing the optical sensors in close proximity to the eyes. This nested configuration allows the system to maintain non-contact measurement capability while achieving high measurement accuracy by eliminating the distance limitation of external devices.
Solution Approach 2:
The frame or mask acts as an intermediary carrier that positions the optical sensors close to the eyes without requiring direct contact. This intermediary structure enables the system to overcome the trade-off between non-contact operation and measurement precision by providing a stable platform for the sensors near the target.
2Device complexity
If external devices remotely observe the subject's eye, then the measurement process is simplified, but the determination of half-pupillary distances becomes imprecise
Solution Approach 1:
By nesting the optical sensors within a frame or mask worn by the subject, the system achieves close proximity to the eyes, enabling precise measurement of half-pupillary distances. This nested configuration maintains relative system simplicity while dramatically improving the precision of anatomical parameter determination.
3Measurement precision
If optical sensors are placed close to the eye in a worn device, then measurement accuracy improves, but the device complexity increases
Solution Approach 1:
The frame or mask serves multiple functions: it positions the optical sensors close to the eyes for accurate measurement, provides a stable mounting structure, and can be integrated with existing eyewear. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity while achieving high measurement precision.
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
This method improves measurement accuracy by working close to the eye, eliminating the need for distant observation, and enables the determination of precise ophthalmological parameters for personalized lens and frame manufacturing, enhancing the adaptation of glasses to individual anatomical features.
Implementation Method 1
The eye-tracking device includes at least one optical sensor per eye... each illumination being in particular a visible and/or infrared illumination... the right and left optical sensors being respectively sensitive to the right and left illumination
Data Source
Figure 1~2
AI summary
The invention relates to a method for determining at least one ophthalmological parameter of a subject, consisting of the subject's semi-pupillary distances, comprising observing the subject's two eyes using an eye tracking device (30) borne by the subject and determining the aforementioned parameter at least from this observation.