Scotoma Enveloping Curve Visualization for Retinal Locus Training
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Solution Overview
Problem
Current methods fail to precisely capture and visualize scotomata, leading to suboptimal training of preferred retinal loci for fixation, as they do not provide sufficient information about the shape and size of scotomata, which vary among patients and change over time.
Innovation Solution
An apparatus and method that continuously captures eye alignment, samples the visual field point-by-point to determine suitable and unsuitable regions, calculates the scotoma's outer boundary line, and displays an outer enveloping curve on a display unit, allowing patients to perceive the scotoma's frame and facilitating precise determination of optimal fixation points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional perimetry or campimetry methods are used to measure the visual field, then the measurement process is simple and quick, but the information about the shape and size of scotomata is insufficient
Solution Approach 1:
The visual field measurement is segmented into multiple discrete test points that are sampled systematically across the visual field. This allows detailed mapping of scotoma boundaries and shape while maintaining a manageable measurement process through point-by-point assessment rather than continuous measurement.
Solution Approach 2:
The patent transitions from traditional 2D visual field mapping to a 3D representation by incorporating depth information through the enveloping surface that surrounds the scotoma. This additional dimension provides comprehensive shape information while organizing complex data in an intuitive spatial framework.
2Loss of information
If imaging methods such as SLO, OCT, or fundus photography are used to image the retina, then the retinal damage regions can be determined objectively, but the subjectively perceived visual field cannot be determined
Solution Approach 1:
The patent merges objective retinal imaging data with subjective visual field perception data into a unified measurement system. By combining these previously separate measurement approaches, the system provides both objective anatomical information and subjective functional information about the visual field simultaneously.
Solution Approach 2:
The patent introduces an intermediary computational model that correlates retinal image data with subjective visual field reports. This intermediary layer processes and integrates data from both objective imaging and subjective perception, allowing determination of the subjectively perceived visual field based on retinal anatomy and patient response.
3Measurement precision
If a fixed preferred retinal locus is assumed for all patients, then the training process is simplified, but the effectiveness of visual task performance is reduced
Solution Approach 1:
The patent applies local quality by determining the preferred retinal locus individually for each patient based on their specific scotoma characteristics and visual field configuration. Rather than using a universal fixation point, the system adapts the optimal locus to the local visual field conditions of each patient, improving both precision and adaptability.
Solution Approach 2:
The preferred retinal locus is determined dynamically based on the patient's current visual field status and scotoma configuration. The system allows the optimal fixation point to change as the patient's visual field evolves or as different visual tasks require different optimal loci, making the training adaptable rather than static.
Data Source
AI summary
A method and an apparatus for capturing a visual field of a person having a scotoma, in particular a central scotoma, are disclosed. The method includes continuously capturing the eye alignment of the person with a capturing unit, sampling the visual field of the person point-by-point to determine points suitable and not suitable for sight in the visual field of the person, finding the scotoma as a region with a multiplicity of points not suitable for sight, calculating an outer boundary line of the scotoma, calculating an outer enveloping curve, which surrounds the outer boundary line of the scotoma at a predetermined distance, and displaying the outer enveloping curve on a display unit. The enveloping curve is perceivable by the person on the display unit as a frame of the scotoma.