Fundus Observation Device Magnification Correction
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Solution Overview
Problem
Conventional fundus oculi observation devices face challenges in accurately setting measurement lines due to individual variations in ocular optical systems, leading to measurement errors in evaluating fundus oculi layer thickness.
Innovation Solution
A fundus oculi observation device that includes an OCT unit and a retinal camera unit, where the OCT unit uses low-coherence light to form tomographic images, and a scanning unit to accurately scan and position the signal light, allowing for precise calculation of ocular optical system magnification and accurate setting of measurement lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fundus oculi observation devices are used, then the device structure is simple, but measurement precision of fundus oculi layer thickness deteriorates due to individual variations in ocular optical systems
Solution Approach 1:
The device performs preliminary measurement of ocular optical system parameters (axial length, corneal curvature, lens power) before conducting fundus oculi imaging. These preliminary measurements are used to calculate individual-specific magnification factors that are then applied to correct the layer thickness measurements, thereby resolving the measurement precision issue without requiring complex real-time adjustments during imaging
Solution Approach 2:
The patent introduces an intermediary calculation process that uses measured ocular optical parameters (axial length, corneal curvature radius, lens power) to compute a magnification factor. This intermediary magnification factor serves as a correction coefficient that bridges the gap between the simple imaging system and the precise measurement requirement, allowing accurate layer thickness evaluation while maintaining relatively simple device structure
2Measurement precision
If individual variations in ocular optical systems are not accounted for, then the device operation is simple, but measurement precision of layer thickness deteriorates
Solution Approach 1:
The device performs self-calibration by automatically measuring the patient's ocular optical parameters (axial length, corneal curvature, lens power) and using these measurements to compute and apply the appropriate magnification factor. This self-service approach eliminates the need for manual calibration or complex operator intervention, maintaining ease of operation while achieving high measurement precision through individualized correction
Solution Approach 2:
The system implements a feedback mechanism where the measured ocular optical parameters are fed back into the measurement calculation process. The axial length, corneal curvature, and lens power measurements provide feedback that allows the system to adjust the magnification factor accordingly, ensuring that layer thickness measurements are automatically corrected for each patient's unique optical characteristics without requiring manual adjustment
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 accurate measurement of fundus oculi layer thickness by accounting for individual ocular optical system variations, reducing measurement errors and improving the precision of layer thickness evaluation.
Implementation Method 1
an OCT unit (150) which uses low-coherence light to form tomographic images
Data Source
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AI summary
A fundus oculi observation device comprises: an image forming part (220) configured to optically acquire data and form a tomographic image of a fundus oculi of an eye; a storage (212) configured to store optical information (V) representing a state of an ocular optical system of the eye; a calculator (231) configured to calculate a magnification of the ocular optical system, based on the optical information (V); and an analyzer (232) configured to analyze the tomographic image, based on the magnification.