Handheld Vision Tester with Internal Illumination
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Solution Overview
Problem
Current vision testing methods are inefficient due to the need for multiple, costly, and non-portable instruments that require significant space and struggle with controlling ambient light, limiting comprehensive testing of contrast sensitivity, visual acuity, color vision, and glare impairment.
Innovation Solution
A compact, hand-held device with internal illumination that integrates multiple vision tests, including contrast sensitivity, visual acuity, color vision, and glare testing, using interchangeable charts and accessories for controlled lighting and adjustable focusing, along with a pinhole-lens clip for occlusion and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate vision testing instruments are used to measure contrast sensitivity, visual acuity, color vision, and glare impairment, then comprehensive vision testing can be performed, but the device complexity, cost, and space requirements increase significantly
Solution Approach 1:
The patent combines multiple separate vision testing instruments into a single handheld device that can perform contrast sensitivity testing, visual acuity measurement, color vision testing, and glare impairment assessment. The device integrates multiple functions including interchangeable charts, internal illumination, and various testing modes into one unified instrument, eliminating the need for multiple separate devices.
Solution Approach 2:
The handheld vision tester is designed as a universal device capable of performing multiple types of vision tests through interchangeable charts and adjustable settings. The device can test contrast sensitivity at various levels, measure visual acuity, assess color vision, and evaluate glare impairment, making it applicable for comprehensive vision screening in diverse clinical settings.
2Reliability
If non-portable vision testing instruments are used, then stable testing conditions can be maintained, but the space requirements and portability are significantly reduced
Solution Approach 1:
The patent integrates the illumination system, chart display, and testing mechanisms into a single portable handheld device. The internal illumination source and diffuser assembly provide controlled lighting conditions within the device itself, eliminating dependence on external lighting while maintaining portability.
Solution Approach 2:
The device uses an internal illumination system with a diffuser assembly as an intermediary to provide controlled, uniform lighting conditions for the vision charts. This internal lighting mediator ensures consistent testing conditions regardless of ambient light variations, while the compact handheld design maintains portability.
3Device complexity
If externally illuminated vision charts are used, then simple device structure can be achieved, but the control over ambient light and testing consistency is lost
Solution Approach 1:
The patent introduces an internal illumination system with a diffuser assembly as an intermediary between the light source and the vision chart. This intermediary component distributes light uniformly across the chart while shielding it from ambient light interference, providing consistent testing conditions.
Solution Approach 2:
The device creates a controlled optical environment by using internal illumination that is isolated from ambient light conditions. The housing and internal lighting system create an optically controlled atmosphere within the device, ensuring that testing conditions remain consistent regardless of external lighting variations.
4Measurement precision
If multiple separate testing devices are used, then each test can be performed with specialized equipment, but the time required for comprehensive testing increases
Solution Approach 1:
The patent combines multiple specialized testing functions into a single handheld device with quick-interchangeable charts and adjustable settings. The device maintains the precision of specialized tests while eliminating the time required to set up and transition between multiple separate instruments.
Solution Approach 2:
The device incorporates dynamic, adjustable features including interchangeable charts for different test types, adjustable illumination intensity, and configurable testing parameters. This dynamic design allows the single device to adapt to different testing requirements while maintaining measurement precision comparable to specialized equipment.
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 efficient, portable, and comprehensive vision testing in various clinical settings, reducing costs and space requirements while improving healthcare outcomes by simplifying the testing process and minimizing the impact of ambient light.
Implementation Method 1
a light source for illuminating a display window
Implementation Method 2
means of housing and providing optical elements for focusing at the designated testing distances
Data Source
AI summary
A vision testing device for measuring single or multiple visual functions consisting of an internally illuminated hand-held instrument, vision charts, vision correcting and occluding elements, a testing frame for holding combined vision correcting and blocking elements, and modular accessories.