Ophthalmologic Measuring Device Triangulation Interferometry
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Solution Overview
Problem
Current ophthalmological measuring devices face limitations in geometric precision due to movement artifacts and restricted depth measurement ranges, with triangulating methods being limited to the anterior chamber area and interferometric methods suffering from reduced depth resolution and increased motion artifacts.
Innovation Solution
An ophthalmological measuring device combining an optical, triangulating system for geometric reference determination and an optical, interferometric system for detailed structure measurement, allowing for high-resolution, artifact-reduced imaging across the entire eye by using geometric references to position detailed structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If triangulating measuring devices are used, then geometric precision is improved and movement artifacts are reduced, but the measuring range is limited to the anterior chamber area
Solution Approach 1:
The measuring device is divided into two separate measuring systems: a triangulating first measuring system for determining geometric references in the anterior chamber area, and an interferometric second measuring system for determining detailed geometric structures in the posterior chamber area. Each system operates independently in its optimal measurement zone, allowing the device to overcome the limited measuring range of triangulating methods while maintaining high geometric precision where needed.
2Area of stationary object
If interferometric methods are used, then the measuring range is expanded to include the posterior chamber, but movement artifacts increase and depth resolution decreases
Solution Approach 1:
Different measuring systems are applied to different regions of the eye based on their respective strengths. The triangulating system is used for the anterior chamber area where high geometric precision is critical, while the interferometric system is used for the posterior chamber area where extended measuring range is more important. This local optimization allows each system to operate in its optimal performance zone.
3Measurement precision
If high lateral resolution is achieved in interferometric methods, then measurement precision is improved, but the depth measurement range must be designed much smaller
Solution Approach 1:
The measurement task is segmented into two parts: lateral resolution requirements are met by the interferometric system for detailed structure measurement in the posterior chamber, while depth measurement range requirements are met by combining this with the triangulating system's capability to measure larger axial distances in the anterior chamber. The geometric references from the triangulating system enable the interferometric system to operate effectively within its optimal depth range.
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 combination enables accurate, high-resolution geometric structure measurement across the eye, overcoming the limitations of both triangulating and interferometric methods by minimizing movement artifacts and expanding the measurable range, allowing for the use of less expensive and slower OCT techniques with larger depth ranges.
Implementation Method 1
an optical, triangulating first measuring system for determining at least one geometric reference in the eye by triangulation
Implementation Method 2
an optical, interferometric second measuring system for determining (two- and/or three-dimensional) geometric detailed structures in the eye (in particular in the anterior chamber area of the eye) by optical interferometry
Data Source
Figure 1~2
Figure 3a~3b
Figure 4~5
AI summary
The device (1) has an optical triangulated measuring system (11) determining a geometric reference in an eyelet (2) through triangulation. An optical interferometric measuring system (12) determines geometric detail structures in the eyelet by optical ferometric based on the geometric reference in the eyelet determined by the optical triangulated measuring system. The optical triangulated and interferometric measuring systems are coupled, and a light projector (112) projects a light gap (114). An independent claim is also included for an ophthalmologic measuring method for determining a geometric structure of eyelet.