Vision Testing Device With Fixed Fixation Target

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Solution Overview

Problem

Existing vision testing systems using dynamic fixation require transformation processing of test results, which complicates the assessment of visual field defects, and do not effectively account for variations in tap sensitivity and attention levels across different eccentricities from the fixation point.

Innovation Solution

A vision testing device and system that displays visual targets on a touch screen with a fixed fixation target, varying the number and sensitivity of targets based on eccentricity, and includes features like tap sensitivity and attention level regulation, and response time limits to simplify test results and improve accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If dynamic fixation is employed in vision testing, then the test can accommodate natural eye movements, but the test results require transformation processing to determine visual field defects

Engineering Contradiction:

Improveaccommodation of natural eye movementsVSAvoidtransformation processing of test results

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Instead of moving the fixation target to accommodate eye movements (dynamic fixation), the patent inverts the approach by keeping the fixation target fixed and moving the visual targets to different positions. This allows the system to capture visual field information without requiring complex transformation processing of results, as the fixed fixation point provides a stable reference frame for direct interpretation of test results.

Inventive Principle:

Principle #13The other way round (Inversion)

2Area of stationary object

If visual targets are displayed at different eccentricities from the fixation point, then comprehensive visual field coverage is achieved, but tap sensitivity and recognition ease vary across positions

Engineering Contradiction:

Improvevisual field coverageVSAvoidtap sensitivity consistency

Core Design Contradiction:

Area of stationary objectVSMeasurement precision

Solution Approach 1:

The patent applies local quality by adjusting visual target parameters (size, luminance, presentation time) based on their eccentricity from the fixation point. Targets displayed at higher eccentricities are made larger or more luminous to compensate for reduced acuity in peripheral vision, ensuring consistent detection accuracy across the entire visual field while maintaining comprehensive coverage.

Inventive Principle:

Principle #3Local quality

3Productivity

If multiple visual targets are presented simultaneously, then testing efficiency is improved, but response time requirements become more complex

Engineering Contradiction:

Improvetesting efficiencyVSAvoidresponse time management

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent presents multiple visual targets simultaneously at selected locations across the visual field, allowing the testee to respond to one or more targets within a given response time window. This partial action approach (presenting multiple targets but requiring response to at least one) improves testing efficiency by gathering multiple data points in parallel while maintaining manageable response time requirements through flexible scoring that accounts for the number of targets presented.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20230309815A1Vision testing device, vision testing system, and vision testing program

Publication Date: 2023.10.05 CREWT MEDICAL SYST

AI summary

A vision testing device and related technique, the vision testing device including a touch screen, sequentially displaying visual targets on the touch screen while displaying a fixation target whose position is fixed on the touch screen, during a period from the beginning to the end of the test, and providing a test result based on whether a testee taps the visual target or not.