Refractive Power Measurement Instrument with Dynamic Mode Switching
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Solution Overview
Problem
Conventional instruments for measuring refractive power face challenges in acquiring stable data, especially for babies, children, and individuals with small pupils or abnormal eye positions, often requiring cumbersome operations and repeated measurements, leading to inefficient and inaccurate results.
Innovation Solution
A handheld instrument with a target and light projection units that allows for high-speed refractive power measurement by intermittently projecting light and using a judgment unit to assess data reliability based on distribution and elapsed time, enabling faster and more accurate measurements without cumbersome operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a handheld type instrument is used for measurement, then ease of operation is improved, but measurement reliability deteriorates due to handshaking and insufficient measurement time
Solution Approach 1:
The instrument dynamically switches between normal measurement mode and high-speed measurement mode based on real-time judgment of data reliability. The measurement mode is not fixed but adapts to the measurement conditions, allowing the system to optimize between accuracy and speed depending on the situation.
Solution Approach 2:
The system changes the measurement parameter (measurement speed) by switching between normal and high-speed modes. This parameter change allows the instrument to adapt to different measurement scenarios, using faster acquisition when reliability is compromised and slower acquisition when stability is achieved.
2Measurement precision
If measurement time is extended to improve data stability, then measurement precision is improved, but productivity deteriorates due to long measurement time
Solution Approach 1:
The measurement process is made dynamic by continuously monitoring data reliability and switching between measurement modes. This allows the system to extend measurement time when needed for precision and reduce it when speed is prioritized, optimizing the balance between precision and productivity.
Solution Approach 2:
The judgment unit provides feedback on data reliability to the measurement unit, creating a closed-loop control system. This feedback mechanism allows the instrument to automatically adjust measurement duration and speed based on the quality of acquired data, ensuring optimal balance between precision and efficiency.
3Reliability
If repeated measurements are performed to improve data reliability, then measurement precision is improved, but ease of operation deteriorates due to cumbersome operations
Solution Approach 1:
The instrument performs self-diagnosis and self-adjustment by automatically judging data reliability and switching measurement modes without operator intervention. The system serves itself by detecting measurement quality issues and correcting them through automatic mode switching, eliminating the need for manual repeated measurements.
Solution Approach 2:
The judgment unit continuously monitors measurement data and provides feedback to the measurement unit, enabling automatic adjustment of measurement parameters. This feedback loop allows the system to improve data reliability through automatic repeated measurements only when necessary, without requiring cumbersome manual operations.
4Productivity
If high-speed measurement mode is used, then productivity is improved, but measurement precision deteriorates due to fewer data sets
Solution Approach 1:
The measurement system dynamically adjusts the number of data sets collected based on the selected mode. In high-speed mode, the system accepts fewer data sets for faster measurement, while in normal mode, it collects more data sets for higher precision. This dynamic adjustment optimizes the balance between productivity and precision.
Solution Approach 2:
The system changes the measurement parameter (number of data sets) by switching between high-speed and normal modes. This parameter change allows the instrument to prioritize speed when productivity is critical and prioritize accuracy when measurement precision is the main objective.
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
The instrument achieves quick and accurate refractive power measurements by switching between normal and high-speed modes, ensuring reliable data acquisition even in unstable conditions, thus improving measurement efficiency and reducing the need for repeated measurements.
Implementation Method 1
The light receiving unit receives measurement light that is projected by the measurement light projecting unit and reflected from the examined eye
Data Source
AI summary
An instrument for measuring a refractive power includes a target, a target projecting unit, a measurement light projecting unit, a light receiving unit, a unit for performing a normal refractive power measurement, a judgment unit, and a unit for performing a high-speed refractive power measurement. The unit for performing a normal refractive power measurement measures a normal refractive power of an examined eye based on received light data. The judgment unit judges reliability of the received light data or the refractive power measurement. The unit for performing a high-speed refractive power measurement measures a refractive power of the examined eye faster than the unit for performing a normal refractive power measurement in response to a judgment result of the judgment unit.