Multi-view Ophthalmic Diagnostic System for Accurate IOL Profiling
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Solution Overview
Problem
Current ophthalmic diagnostic systems, particularly those using Optical Coherence Tomography (OCT), face limitations in accurately measuring the curvature and refractive indices of ocular tissues, such as the cornea, due to their reliance on single-view imaging, which can result in incomplete and inaccurate data for intraocular lens (IOL) profiling.
Innovation Solution
A multi-view ophthalmic diagnostic system is developed, incorporating an OCT engine, scanner, camera, and beam splitter with multiple optical elements defining beam paths at different angles, allowing for simultaneous OCT and illumination light imaging. This system processes data from multiple perspectives to determine refractive indices and curvatures of ocular tissues, including the cornea, aqueous humor, and vitreous humor, using first and second-order Purkinje ray tracing techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-view OCT imaging is used, then the system structure is simple, but the measurement precision of curvature and refractive indices is insufficient
Solution Approach 1:
The patent transitions from single-view to multi-view imaging by introducing multiple beam paths at different angles (0°, 45°, 90°). This dimensional expansion from one viewing angle to multiple viewing angles enables comprehensive measurement of corneal curvature and refractive indices that cannot be achieved with single-view imaging alone.
Solution Approach 2:
The system divides the imaging function into multiple independent beam paths, each capturing specific information from different angles. The beam splitter separates the OCT beam into multiple paths that can be independently processed, allowing simultaneous acquisition of data from different viewing angles without requiring a completely complex reconfigurable system.
2Measurement precision
If multi-view imaging with multiple beam paths is implemented, then measurement precision improves, but device complexity increases
Solution Approach 1:
The beam splitter serves multiple functions: it divides the OCT beam into multiple paths for multi-view imaging, simultaneously enables illumination light to reach the cornea from different angles, and allows the camera to capture images from multiple perspectives. This multi-functionality reduces the need for separate dedicated components for each function.
Solution Approach 2:
The patent combines OCT imaging and illumination imaging into a single integrated system sharing common optical components (beam splitter, mirrors, camera). By merging these two imaging modalities, the system achieves multi-view measurement capability while avoiding the complexity of having completely separate imaging systems.
3Loss of information
If multiple OCT imaging beams are directed along different beam paths, then complete data for IOL profiling is obtained, but the scanner complexity increases
Solution Approach 1:
The beam paths are pre-configured at specific angles (0°, 45°, 90°) during system assembly rather than being dynamically adjustable. This preliminary configuration of the optical path geometry ensures that all necessary viewing angles are automatically provided without requiring complex real-time scanning or adjustment mechanisms.
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 system achieves more accurate curvature measurements and increased accuracy in determining ocular tissue shapes, enabling a more precise three-dimensional model of the eye, which is crucial for optimizing IOL profiles and improving surgical precision.
Implementation Method 1
OCT systems perform high-resolution, cross sectional imaging in semitransparent samples (such as biological tissues) by measuring the echo time delay of reflected light
Implementation Method 2
detect illumination light reflected by the ophthalmic target along each respective beam path
Implementation Method 3
determine a refractive index of at least one of a cornea, aqueous humor, a lens, or vitreous humor of the ophthalmic target based on the detected OCT light
Data Source
AI summary
A multi-view diagnostic system includes an OCT engine and a plurality of optical elements defining a plurality of beam paths between the OCT engine and an ophthalmic target, with each beam path corresponding to a different viewing angle of the ophthalmic target. The system also includes a scanner to direct OCT imaging beams generated by the OCT engine toward the ophthalmic target along each respective beam path. Instructions stored in memory are executable by a processor to determine a characteristic of the ophthalmic target based on OCT light reflected by the ophthalmic target along each respective beam path and detected by the OCT engine.