Perimeter Blind Spot Coordinate Correction
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Solution Overview
Problem
Individual variations in the position of the blind spot with respect to the macula lutea on a fundus image make it impossible to conduct accurate perimetry without coordinate correction.
Innovation Solution
A perimeter system that sets a first visual field coordinate system on a visual field dome and a second visual field coordinate system on a fundus image, allowing for the provisional determination and correction of the blind spot position, enabling accurate correspondence between the two systems to compensate for individual variations and conduct perimetry correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a predetermined coordinate system is set on the fundus image with the blind spot at a fixed position, then the coordinate system can be established quickly, but accurate perimetry cannot be conducted due to individual variations in blind spot position
Solution Approach 1:
The patent applies preliminary action by first establishing a predetermined coordinate system with a standard blind spot position, then performing coordinate correction based on the actual blind spot position detected through perimetry. This allows the system to have a ready-made coordinate framework while still achieving accurate individualized measurement through subsequent correction steps.
Solution Approach 2:
The patent changes the coordinate parameters by introducing a coordinate correction value that adjusts the predetermined blind spot position to match the actual blind spot position. This parameter adjustment resolves the contradiction by allowing both a predetermined system structure and individualized accuracy through mathematical transformation of the coordinate values.
2Measurement precision
If coordinate correction is performed to compensate for individual variation in blind spot position, then accurate perimetry can be conducted, but the procedure becomes more complex
Solution Approach 1:
The patent introduces a coordinate correction value as an intermediary element that bridges the predetermined coordinate system and the actual individual anatomy. This mediator simplifies the complexity by providing a straightforward mathematical adjustment rather than requiring complete reconstruction of the coordinate system, thus maintaining measurement accuracy while limiting procedural complexity.
3Stability of the object's composition
If the blind spot position is fixed at a predetermined coordinate, then the fundus image can be displayed consistently, but the individual anatomical variations cannot be accommodated
Solution Approach 1:
The patent establishes a stable predetermined coordinate system as a preliminary framework, then adapts it to individual variations through coordinate correction. This allows the fundus image display to maintain consistency from the predetermined system while accommodating individual anatomy through the correction value, thus resolving the contradiction between stability and adaptability.
Solution Approach 2:
The patent changes the coordinate parameters by applying a correction value that adjusts the predetermined blind spot position to the actual position while maintaining the overall coordinate system structure. This parameter transformation allows the system to remain stable in its framework while being adaptable to individual variations through mathematical adjustment.
Data Source
AI summary
A perimeter is comprised of means for setting a second visual field coordinate system on a fundus image displayed on a monitor wherein an origin is a macula lutea, means for provisionally determining a blind spot position on the second visual field coordinate system, means for searching a coordinate position of a blind spot on the first visual field coordinate system by presenting a stimulus on the visual field dome, means for changing a scale of the second visual field coordinate system so as to correspond the coordinate value of the blind spot on the first visual field coordinate system and the coordinate position of the blind spot on the second visual field coordinate system with each other, and means for conducting a perimetry by presenting the stimulus at a position on the first visual field coordinate system having the same coordinate value as one on the second coordinate system of a predetermined test point.