Scheimpflug Ophthalmic Analysis System Integration
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Solution Overview
Problem
Current ophthalmological analysis systems for deriving the refractive ratio and axial length of the eye are cumbersome and require separate examination devices, limiting their practicality for calculating intraocular lenses and diagnosing conditions like keratoconus and cataracts.
Innovation Solution
A method involving a Scheimpflug recording device and slit projection system where a raster screen divides the illumination slit into sections, allowing for the derivation of the refractive index and axial length by analyzing scattered light patterns, with the eye fixed at an infinite distance, enabling comprehensive three-dimensional imaging of the eye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate examination devices are used to determine axial length and refractive ratio, then measurement accuracy is improved, but device complexity and ease of operation worsen
Solution Approach 1:
The patent combines the axial length measurement device and the refractive ratio measurement device into a single integrated ophthalmological examination system. The slit projection device and Scheimpflug recording device serve dual purposes: they project illumination slits for refractive ratio measurement and record sectional images for axial length determination, eliminating the need for separate examination devices while maintaining measurement accuracy
Solution Approach 2:
The examination system is designed with multi-functional components that perform multiple measurement tasks. The slit projection device can project slits at different orientations and positions to measure both refractive ratios of different eye components and axial length, making the system universal and reducing overall device complexity
2Reliability
If separate examination devices are used for axial length and refractive ratio, then measurement reliability is improved, but ease of operation worsens
Solution Approach 1:
By merging the measurement functions into a single examination system with unified calibration and operation procedures, the patent improves ease of operation while maintaining reliability through consistent measurement conditions and integrated data processing
3Loss of information
If multiple examination devices are used, then comprehensive eye data is obtained, but productivity and time efficiency worsen
Solution Approach 1:
The integrated system captures both refractive ratio data and axial length data during a single examination session, eliminating the need for multiple separate device operations and significantly improving time efficiency while maintaining comprehensive data collection
Solution Approach 2:
The system performs multiple measurements continuously during one examination procedure, with the slit projection and image recording occurring in sequence without requiring the patient to leave or switch devices, thereby maintaining continuous useful action and improving productivity
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 method simplifies the determination of refractive ratios and axial lengths, facilitating precise calculations for intraocular lenses and aiding in the diagnosis of eye conditions like keratoconus and cataracts, while integrating with existing systems for enhanced functionality.
Implementation Method 1
the refracting media in the eye are not crystal clear, but rather a clear scattering occurs on them, especially in the short-wave portion of visible light. This results in a sharply focused beam of light, i.e. the projected slit of light that is sent through the optical media of the eye, becoming visible when viewed from the side.
Implementation Method 2
The Scheimpflug condition requires that the projection plane, this is the plane in the eye illuminated by the slit projection device, intersects the main plane of the lens system and the image plane between a common axis.
Data Source
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AI summary
The invention relates to a method for operating an ophthalmological analysis system with a slit projection device for illuminating the eye and a Scheimpflug imaging device for acquiring digitized cross-sectional images of the eye, wherein the slit projection device and the Scheimpflug imaging device are mounted together so as to be rotatably pivotable about an axis that essentially coincides with the optical axis of the eye. In a first position of the slit projection device and the Scheimpflug imaging device, a cross-sectional image of the eye is acquired and stored as the first image data set. Subsequently, the slit projection device and the Scheimpflug imaging device are rotated and pivoted at least once and fixed in each subsequent (second, third, fourth, ...) position. In each subsequent (second, third, fourth, ...With the slit projection device and Scheimpflug imaging device positioned, a cross-sectional image of the eye is captured and stored as a subsequent (second, third, fourth, ...) image data set. In a digital image data analysis device, a multidimensional descriptive model of at least one component of the eye is derived through digital image data analysis of the various image data sets and stored as a result data set. The result data set is output in a suitable format to a data output device.