Vision Measurement Using UWB Distance Tracking
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Solution Overview
Problem
Conventional vision measurement methods using home devices like smartphones or tablets for refraction and visual acuity are inaccurate due to unreliable distance measurements, which are often estimated or based on user input and can't account for changes during the measurement process.
Innovation Solution
A method and device using wireless communication interfaces, particularly Ultra-Wideband technology, to continuously and accurately determine the distance between the measurement device and the user, enabling precise and repeated vision measurements by adjusting parameters like optotype size or orientation based on real-time distance and orientation data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distance measurement is performed using conventional methods (user input or camera-based estimation), then the measurement can be performed, but the accuracy and reliability of distance determination deteriorates
Solution Approach 1:
The patent replaces conventional mechanical or manual distance measurement methods (camera-based estimation, user input, step counting) with an electromagnetic field-based wireless communication system. The distance determination unit uses wireless signals exchanged between the measurement device and portable device to calculate distance based on signal propagation characteristics, thereby achieving higher accuracy and reliability without mechanical components or manual intervention.
Solution Approach 2:
The patent introduces a wireless communication interface as an intermediary between the measurement device and portable device. This intermediary enables indirect distance measurement through signal exchange, where the wireless communication system acts as a mediator that translates physical distance into measurable signal parameters, resolving the contradiction between measurement feasibility and accuracy.
2Reliability
If distance measurement is performed only once at the beginning, then the device complexity is reduced, but the measurement reliability deteriorates due to unaccounted distance changes
Solution Approach 1:
The patent implements continuous distance determination by repeatedly exchanging wireless signals between the measurement device and portable device throughout the vision measurement process. This continuous monitoring ensures that any distance changes are detected and accounted for in real-time, maintaining measurement reliability without requiring complex additional hardware, as the existing wireless communication infrastructure is utilized for ongoing distance tracking.
3Productivity
If manual distance adjustment is required during measurement, then the ease of manufacture is improved, but the productivity and measurement efficiency deteriorate
Solution Approach 1:
The patent enables the system to automatically determine and adjust distance parameters without requiring manual intervention from the user. The distance determination unit continuously monitors distance through wireless communication and automatically adjusts measurement parameters based on the determined distance, making the system self-sufficient and eliminating the need for users to manually adjust their position or input distance information.
Data Source
AI summary
Methods and devices for measuring the vision of a person are provided The method includes determining a distance between a measurement device and the person. The distance is determined by communicating between a first wireless communication interface of the measurement device and a second wireless communication interface of a portable device on the person. Then, the vision measurement is performed based on the distance.