Quantitative Vision Disorder Detection via Digital Grid Deviation
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Solution Overview
Problem
Current methods for detecting and monitoring visual field disorders, such as metamorphopsia and scotoma, are qualitative and lack the ability to provide quantitative assessments, making it difficult to accurately measure the severity and progression of these conditions, particularly in diseases like age-related macular degeneration.
Innovation Solution
A device and method using a display with a square reticule of equidistant parallel lines and a focus point, where the lines can be modified by input signals to transform perceived curved lines back to their original state, allowing for the quantitative measurement of geometrical deviations as the sum of absolute horizontal and vertical deviations, utilizing boundary functions like splines and Bézier curves for optimal adaptation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If qualitative detection methods (Amsler grid) are used, then the device complexity is low and ease of operation is high, but measurement precision and quantitative assessment capability are insufficient
Solution Approach 1:
The patent replaces the purely qualitative visual assessment method (Amsler grid) with a computational system that uses digital displays, coordinate tracking, and mathematical calculations (boundary functions, deviation measurements) to quantitatively measure metamorphopsia. This substitution of mechanical/visual methods with computational methods enables precise quantitative detection while maintaining ease of use through software-based analysis.
2Measurement precision
If elaborate diagnostic methods (OCT, fluorescence angiography) are used, then measurement precision is high, but device complexity and loss of time increase
Solution Approach 1:
The patent extracts the specific function of detecting metamorphopsia from the complex suite of ophthalmological diagnostic tools. By isolating and measuring only the geometric distortion aspect using a simplified digital grid and coordinate system, the method achieves high measurement precision for metamorphopsia specifically without requiring the time-consuming comprehensive diagnostic procedures like OCT or fluorescence angiography.
Solution Approach 2:
The patent changes the measurement parameter from comprehensive structural analysis (retinal thickness, vascular patterns) to specific geometric deviation parameters (coordinate displacements, boundary function deviations). This parameter change enables rapid detection of metamorphopsia with high precision while minimizing detection time, as it focuses only on the relevant geometric distortion rather than进行全面 structural assessment.
3Measurement precision
If comprehensive structural analysis methods are used, then measurement precision is high, but ease of operation decreases and device complexity increases
Solution Approach 1:
The patent implements a self-service system where the patient independently interacts with the digital grid display and provides input signals representing their perceived distortion. The system automatically processes these inputs through boundary functions and coordinate calculations to generate quantitative measurements. This self-service approach maintains ease of operation while achieving high measurement precision, eliminating the need for complex manual procedures by specialists.
Data Source
AI summary
The present invention relates to a device and to a method for the quantitative detection of disorders in the field of vision of an eye of a test subject, in particular in the case of eye diseases which are associated with macular edema, wherein a square grid is displayed on a display device whose grid lines which are perceived by the test subject as curved can be modified by the subject in such a way that the subject can view an orthogonal reticule again. Such lines perceived as curved can be modified by input signals which modify the boundary curves defined by the boundary functions in such a way that the originally displayed linear reticule is perceived again, wherein the geometric deviations caused by transformation of the regions of the square reticule perceived as curved from the originally present squares are determined quantitatively as the sum of the absolute values of the horizontal deviations and as the sum of the absolute values of the vertical deviations.