Dynamic Visual Acuity Device Multi-Directional Target Movement
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Solution Overview
Problem
Current dynamic visual acuity measurement methods only assess reactions to horizontally moving visual targets, limiting the information obtained about human reactions to visual stimuli, as eye movements involve cooperation of multiple extraocular muscles and vary with direction.
Innovation Solution
A dynamic visual acuity measuring device and method that includes a projector, reflecting mirror, and rotatable components to move a visual target image in arbitrarily defined directions, allowing for more comprehensive assessment of human reactions by changing the direction of the index image pattern movement relative to the subject.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the visual target image moves only horizontally, then the measurement system remains simple, but the information obtained about human reactions is limited
Solution Approach 1:
The patent applies the dynamics principle by making the visual target image movable in multiple directions (horizontal, vertical, and diagonal) rather than fixed in a single horizontal direction. The target image can be dynamically repositioned across different areas of the display screen, allowing measurement of human reactions to stimuli moving in various directions, thereby resolving the contradiction between information completeness and system versatility
Solution Approach 2:
The patent transitions from one-dimensional horizontal movement to two-dimensional movement across the display screen. By adding the vertical dimension and diagonal movement capabilities to the traditional horizontal-only movement, the system can present visual stimuli in multiple directions, obtaining comprehensive reaction information without sacrificing measurement versatility
2Loss of information
If the visual target image moves in multiple directions, then comprehensive information about human reactions is obtained, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing a measurement system that can perform multiple functions: measuring reactions to horizontal movement, vertical movement, and diagonal movement using the same basic apparatus. The display screen and control system serve universal purposes of presenting visual stimuli in various directions, avoiding the need for separate measurement devices for each direction and thus managing complexity while achieving comprehensive information gathering
3Ease of operation
If the visual target image moves only in horizontal direction, then the measurement system is simple to operate, but it cannot assess reactions to visually given stimuli in various directions
Solution Approach 1:
The patent applies self-service by implementing automated control of the visual target image movement across multiple directions. The control system automatically manages the complex multi-directional movement patterns, positioning, and timing without requiring manual intervention for each directional change. This automation maintains ease of operation while enabling comprehensive directional assessment capabilities
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
Enables the measurement of human reactions to visual targets moving in various directions, providing a more comprehensive evaluation of visual acuity and human state examination.
Implementation Method 1
a reflecting mirror reflecting light from the projector and including a displaceable reflecting surface
Data Source
AI summary
A dynamic visual acuity measuring device includes a projector projecting an index image pattern, a reflecting mirror reflecting light from the projector, a screen receiving light from the reflecting mirror and displaying the index image pattern, a movable casing holding and maintaining relative positions of the projector, the reflecting mirror, and the screen, a fixed casing supporting the movable casing, and a rotating shaft linking the movable casing rotatably to the fixed casing. In this device, the index image pattern displayed on the screen is moved in one direction by the reflecting mirror being displaced and a direction of movement of the index image pattern is changed in a coordinate system fixed to the fixed casing by the rotating shaft being rotated.