Ocular OCT Biometry With 3D Pupil Tracking and Auto Focus
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Solution Overview
Problem
Existing ophthalmic diagnostics face challenges in achieving precise and reproducible measurements of ocular biometric parameters due to issues such as eye transparency affecting measurement results, and the need for invasive techniques.
Innovation Solution
A method and device using optical coherence tomography (OCT) with a mobile head, two cameras, and advanced scanning techniques like 'Auto C-gate' and 'Auto Focus', along with an encoder for precise positioning, and artificial intelligence for data analysis, to automate and optimize the measurement process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional laser interferometry or partial coherence interferometry is used for measuring ocular biometric parameters, then the measurement can be performed with existing technology, but the precision and diagnostic capability are limited
Solution Approach 1:
The patent transitions from traditional laser interferometry and partial coherence interferometry to swept-source optical coherence tomography (SS-OCT), representing a fundamental change in the measurement parameters and methodology. This parameter change enables higher precision measurements of ocular biometric parameters including axial length, anterior chamber depth, and lens thickness, while providing enhanced diagnostic capabilities through cross-sectional imaging of ocular structures
Solution Approach 2:
The patent divides the measurement process into distinct stages: an initial stage for positioning and focusing, and a main stage for actual biometric measurements. This segmentation allows for optimized measurement protocols, where the initial stage prepares the system by positioning the OCT head at predefined distances (e.g., 37mm for posterior examinations, 52mm or 56mm for anterior examinations) and the main stage performs the precise measurements, thereby improving overall measurement precision
2Adaptability or versatility
If advanced OCT technology is used to improve measurement precision and diagnostic capability, then better diagnostic possibilities are achieved, but the device complexity and operational requirements increase
Solution Approach 1:
The patent implements a universal measurement system that can perform multiple diagnostic functions using the same SS-OCT device. The system measures various ocular biometric parameters (axial length, anterior chamber depth, lens thickness) and provides cross-sectional imaging of different ocular structures (retina, optic nerve, cornea, lens). The method adapts to different examination types (posterior examinations, anterior examinations) by adjusting positioning parameters, demonstrating multi-functionality that enhances diagnostic versatility without requiring separate specialized devices
Solution Approach 2:
The patent employs dynamic adjustment mechanisms including autofocus systems that automatically adjust the focal position, and positioning systems that move the OCT head to predefined distances based on examination type. The system dynamically adapts measurement parameters and positioning during operation, allowing the device to handle various diagnostic requirements with a single unified platform, thereby improving adaptability while managing device complexity through automation
3Reliability
If manual measurement techniques are used, then the process is simple to operate, but human error and reproducibility issues affect measurement reliability
Solution Approach 1:
The patent implements automated measurement systems that perform self-positioning and self-focusing operations. The autofocus system automatically adjusts the focal position to optimize image quality, and the positioning system automatically moves the OCT head to predefined distances (37mm for posterior, 52mm or 56mm for anterior examinations). The system captures images and calculates biometric parameters automatically without requiring manual intervention, thereby eliminating human error and improving measurement reliability while maintaining ease of operation through automation
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously monitors image quality and measurement data, then automatically adjusts positioning and focusing parameters to optimize measurements. The encoder system provides feedback on the position of movable components, allowing the system to maintain precise positioning and reproduce measurements consistently. This feedback loop ensures high measurement reliability while the automation maintains ease of operation
4Ease of operation
If the OCT head is positioned at fixed distances for different examinations, then the measurement setup is simplified, but adaptation to individual patient needs is limited
Solution Approach 1:
The patent employs dynamic positioning and focusing systems that automatically adapt to individual patient needs. The autofocus system adjusts the focal position based on the specific ocular structures being examined, and the positioning system moves the OCT head to optimized distances. While predefined distances are used as starting points (37mm for posterior, 52mm or 56mm for anterior examinations), the system dynamically adjusts these parameters during the examination to optimize image quality and measurement accuracy for each patient, thereby maintaining setup simplicity while achieving high adaptability
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
The method and device provide quick, precise, and reproducible biometric measurements, minimizing human error and enabling detailed examination of eye structures with high resolution, while allowing for quicker and more effective examinations.
Implementation Method 1
a mobile head for optical coherence tomography (OCT), capable of generating and recording optical waves
Implementation Method 2
an encoder for precise positioning
Implementation Method 3
two cameras placed off-axially with respect to the OCT optical axis to determine the position of the centre of the pupil in the eye undergoing examination in three dimensions X, Y, Z
Data Source
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AI summary
The invention relates to a method and device for precise measurement of ocular biometric parameters by means of optical coherence tomography (OCT). This system consists of a mobile OCT head, which generates and records optical waves, a reference path with a controlled displacement mechanism, a measurement path and two off-axial cameras for determining the three-dimensional position of the centre of the pupil in the eye undergoing examination. The proposed method and device are programmed to perform a series of measurement stages, from setting the head and adjusting it to the optimal distance from the eye, on to precise determination of the position of the reference path and focus, and up to detailed scanning of the structures of the eye. The invention offers an improvement in the precision of ophthalmic diagnostics, which has considerable impact on healing and monitoring the state of health of the eyes.