Vision Acuity Testing Luminance Control
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Solution Overview
Problem
The variability in luminance levels across different vision testing devices and environments leads to inconsistent visual acuity test results, particularly affecting older patients, and the need for standardized lighting conditions has become critical due to changes in equipment and reimbursement strategies that require more accurate measurements.
Innovation Solution
A vision testing system that includes a data processing system, a luminance sensor, and a display intensity adjustment system to continuously measure and adjust the luminance of a computer display to maintain it within predetermined ranges, while also considering ambient light and glare sources, ensuring standardized lighting conditions for accurate visual acuity testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If computer displays with widely varying luminance are used for vision testing, then device versatility and ease of operation improve, but measurement precision and reliability deteriorate due to inconsistent test results
Solution Approach 1:
The system incorporates a luminance sensor that continuously monitors the display screen's brightness and feeds this information back to a controller. The controller automatically adjusts the display luminance to maintain it within the standardized range (50-200 cd/m²), ensuring consistent measurement conditions while allowing different display devices to be used.
Solution Approach 2:
The system dynamically changes the luminance parameter of the display screen based on real-time measurements. By adjusting the display's brightness output to maintain it within the specified range, the system adapts different displays to meet standardized testing conditions, resolving the contradiction between device versatility and measurement precision.
2Measurement precision
If the display screen is positioned in difficult-to-access locations for patient viewing, then patient comfort and testing accuracy improve, but ease of operation and calibration accessibility worsen
Solution Approach 1:
The luminance sensor is positioned to automatically monitor the display screen without requiring manual intervention. The system performs self-calibration by continuously measuring the display luminance and making automatic adjustments, eliminating the need for technicians to physically access difficult-to-reach screen locations for calibration measurements.
Solution Approach 2:
The luminance sensor acts as an intermediary device that bridges the gap between the patient's viewing position and the calibration needs. By placing the sensor in a location where it can measure the actual luminance reaching the patient without requiring physical access to the screen, the system enables accurate calibration while maintaining patient comfort.
3Measurement precision
If higher light levels are used during vision testing, then measurement precision improves, but object-affected harmful factors worsen due to patient discomfort and potential eye strain
Solution Approach 1:
The system optimizes the luminance parameter to fall within the specific range of 50-200 cd/m², which has been determined to provide adequate measurement precision while avoiding excessive brightness that could cause patient discomfort or eye strain. This parameter optimization resolves the contradiction between measurement accuracy and patient comfort.
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
This system ensures consistent and accurate visual acuity testing by maintaining standardized lighting conditions, reducing variability and improving the accuracy of test results, which is essential for documenting the benefits of vision correction surgical techniques and meeting reimbursement requirements.
Implementation Method 1
An intensity of light leaving the computer display is continuously measured in a sensor region outside the chart region using a display luminance sensor
Data Source
AI summary
A vision testing system and a method of operating a data processing system for displaying an eye test pattern on a computer display to a patient during an eye examination are disclosed. The method includes causing the data processing system to display the eye test pattern in a chart region of a computer display controlled by the data processing system and characterized by a luminance in regions not displaying the eye test pattern. An intensity of light leaving the computer display is measured in a sensor region outside the chart region using a display luminance sensor. The luminance of the computer display is adjusted to provide a light level within a predetermined range of light levels based on the measured intensity of light. The data processing system can receive the measured intensity and adjust the display luminescence.