Computer-Controlled Visual Acuity Test Apparatus with Randomized Symbol Display
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing visual acuity test devices are limited in their ability to set test values steplessly and randomly select all types of test symbols, such as characters and numbers, for all test values, leading to inaccurate and stressful testing experiences, especially for young children.
Innovation Solution
A visual acuity test apparatus that integrates a test operation instrument with computer-controlled input and storage units for selecting and storing test symbols, and a test symbol display instrument that can randomly or optionally display a wide range of test symbols, including Landolt rings, hiragana characters, alphabets, numbers, and pictures, for all test values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only Landolt rings are used as test symbols with fixed test values, then the device structure is simple, but the adaptability and versatility are limited
Solution Approach 1:
The display unit is designed to universally display multiple types of test symbols (Landolt rings, characters, numbers, pictures) for all test values, allowing a single device to serve multiple testing purposes and accommodate different subject groups including infants, children, and adults
Solution Approach 2:
The control unit enables dynamic selection and randomization of test symbols and test values, allowing the testing parameters to be flexibly adjusted based on the specific testing requirements and subject characteristics
2Measurement precision
If test values are displayed in fixed increments (e.g., 0.1 steps), then the device structure is simple, but the measurement precision is insufficient
Solution Approach 1:
The control unit is designed to accept and display arbitrary test values without restriction to fixed increments, enabling continuous adjustment of visual acuity test values to achieve higher measurement precision and accommodate a wider range of visual acuity levels
3Reliability
If the same test symbols are displayed repeatedly, then the testing process is consistent, but the reliability decreases due to subject memorization
Solution Approach 1:
The control unit implements random selection and periodic variation of test symbols and their display positions, ensuring that the same symbol does not appear at the same location across different test values, thereby preventing subject memorization and improving test reliability
4Adaptability or versatility
If multiple test symbol types are supported for all test values, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The control unit automatically manages the selection, randomization, and display of appropriate test symbols based on the selected test value, eliminating the need for manual chart preparation and simplifying the operator's task to merely selecting test parameters
Data Source
AI summary
An object of the present invention is to provide a visual acuity test apparatus capable of displaying all test symbols provided for each test value by one test apparatus without using a visual acuity chart in which Landolt rings and characters of each country arranged in order according to a test value are displayed on a paper medium or an electric bulletin board, a test symbol card for optometry carried in hand, a precision machine or the like in combination.A means for solving the above-described problem is to equip a visual acuity test apparatus with various types of test symbols by computer control, to enable the test symbols to be displayed in a stepless size by enlarging or reducing the test symbols by comparison in accordance with the test value according to the standards indicated by the Japanese Standards Association, and to change each of the test symbols individually and completely randomly even in a case where a plurality of test symbols is to be displayed at a time, or to optionally select to display the test symbol by an examiner.