Mobile Pupilometry Light Calibration for Distance Variation
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Solution Overview
Problem
Multi-purpose mobile devices, such as smartphones and tablets, are unable to deliver a consistent and precise light intensity to the eye for accurate pupilometry due to uncontrolled distance variations between the light source and the eye, leading to unreliable measurement results.
Innovation Solution
Implementing a method or device with a built-in camera, light stimulus source, and algorithm to determine the distance to the eye and adjust the light intensity accordingly, using auto-focus lenses, range finders, or Perkinje reflections to ensure a consistent light intensity is delivered to the pupil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-purpose mobile devices are used for pupilometry, then device versatility and ease of operation are improved, but measurement precision and reliability deteriorate due to uncontrolled light intensity delivery
Solution Approach 1:
The system uses a camera to detect the intensity of light reflected from the cornea, feeds this information back to a processor, which then adjusts the light stimulus source intensity accordingly to deliver a precise and consistent amount of light to the pupil, resolving the measurement accuracy issue while maintaining mobile device versatility
Solution Approach 2:
The system dynamically changes the light intensity parameter of the light stimulus source based on detected corneal reflection intensity and distance measurements, allowing the device to adapt and deliver consistent light intensity to the pupil regardless of distance variations, thereby improving measurement precision
2Ease of operation
If distance between light source and eye is not controlled, then ease of operation is improved, but light intensity consistency deteriorates
Solution Approach 1:
The camera detects corneal reflection intensity and distance, providing feedback to the processor which adjusts the light stimulus source intensity in real-time to compensate for distance variations, maintaining consistent light delivery to the pupil while allowing free movement of the device
Solution Approach 2:
The system replaces mechanical distance control (fixed positioning) with an optical sensing system (camera-based corneal reflection detection) combined with algorithmic light intensity adjustment, eliminating the need for precise mechanical positioning while maintaining light intensity consistency
3Measurement precision
If professional grade pupilometers are used, then measurement precision and light intensity control are improved, but device complexity and cost increase
Solution Approach 1:
The patent integrates multiple functions (camera for corneal reflection detection, distance measurement, light stimulus delivery, and pupil response recording) into a single mobile device platform, eliminating the need for separate specialized equipment while achieving professional-grade measurement precision through software-based control algorithms
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
Ensures accurate and reliable pupil response measurements by maintaining a consistent light intensity, overcoming the limitations of mobile devices in delivering precise light to the eye.
Implementation Method 1
the algorithm can calculate the optimum or specific light intensity based on the intensity of reflections of light reflected by the cornea
Data Source
AI summary
A method of examining a response from one or more pupils of an eye. The method includes providing a hand-held mobile device with a display, a built-in camera, and a light stimulus source, wherein the light stimulus source can emit light at various intensities; using the mobile device to locate the pupil; using the mobile device to determine a distance between the device and the pupil; applying an algorithm that calculates a specific or optimal light intensity based on the distance between the device and the eye and causes the light stimulus source to emit one or more flashes of light at the specific or optimal light intensity; using the built-in camera to record the response of the pupil to the one or more flashes of light; and displaying on the display the data representative of the response of the pupil to the one or more flashes of light.