Eye Refractive Power Measurement Device with Dynamic Meridian Control
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Solution Overview
Problem
Existing eye refractive power measurement devices are not suitable for high-speed eye accommodation function state measurement due to size and cost increases, and operational convenience issues when switching between normal and high-speed measurement types.
Innovation Solution
A compound device with a refractive power measurement section, a measurement type select section, and a control section that adjusts measurement operations such as meridian directions, sampling numbers, and rotational speed of the motor to accommodate both normal and high-frequency eye accommodation function state measurements without increasing size or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the optical system is rotated at higher speed to measure refractive power within 0.1 second, then measurement speed is improved, but device size increases due to larger motor requirements
Solution Approach 1:
The patent applies dynamics by making the measurement system adaptable through software control rather than fixed hardware configuration. The control section dynamically adjusts measurement parameters (number of meridian directions, sampling frequency) based on measurement type, enabling high-speed measurement without requiring permanently oversized mechanical components. The motor size is optimized for normal speed, and electronic control compensates for the need for higher speeds.
Solution Approach 2:
The patent changes measurement parameters (number of meridian directions, sampling intervals, measurement cycles) rather than physical parameters (motor speed, device size). By reducing the number of meridian directions measured or adjusting sampling frequency, the system achieves faster measurement without increasing motor size or device dimensions.
2Productivity
If the motor rotational speed is increased to enable high-speed measurement, then measurement frequency is improved, but device cost increases due to high-speed component requirements
Solution Approach 1:
The system uses dynamic software control to adjust measurement parameters based on clinical needs. For accommodation function measurement requiring high frequency, the control section reduces meridian directions or increases sampling rate within existing hardware capabilities, avoiding the need for expensive high-speed motors and components.
Solution Approach 2:
The patent achieves variable measurement frequency by changing operational parameters (number of meridian directions, sampling intervals) rather than physical parameters (motor speed). This allows the same hardware to operate at different effective measurement rates, avoiding the cost of high-speed components while maintaining productivity when needed.
3Measurement precision
If continuous high-speed measurement is performed for accommodation function state measurement, then measurement precision for high-frequency components is improved, but operational convenience decreases due to display difficulty at high speed
Solution Approach 1:
The control section dynamically adjusts display and measurement parameters based on the selected measurement type. For accommodation function measurement, it optimizes the display to show high-frequency components appropriately while maintaining continuous measurement. The system adapts the user interface to match the measurement mode, preserving operational convenience despite high-speed continuous measurement.
4Measurement precision
If the number of meridian directions measured is increased for comprehensive refractive power measurement, then measurement precision is improved, but measurement time increases
Solution Approach 1:
The patent allows dynamic adjustment of the number of meridian directions measured based on measurement type. For normal refraction measurement, all meridian directions are measured for comprehensive precision. For accommodation function measurement, the system reduces the number of meridian directions or increases sampling rate, achieving acceptable precision with shorter measurement time.
Data Source
AI summary
The present invention provides a compound device having an eye refractive power measurement function and an eye accommodation function state measurement function, preventing an increase in size and cost in comparison with a known eye refractive power measurement device, and convenient for the operator even when the measurement type is changed. An eye refractive power measurement device includes a measurement type select switch (30) which selects one of at least two types of measurements including normal refractive power measurement, which measures the refractive power of the subject s eye including spherical power, cylinder power, and astigmatism axis, and eye accommodation function state measurement, which determines a change in the refractive power of the subject s eye for high-frequency components. A refractive power measurement section (40) is a multiple meridian direction refractive power measurement section which can measure the eye refractive power in two or more meridian directions. The multiple meridian direction refractive power measurement section measures the refractive power in at least two meridian directions when performing the normal refractive power measurement. The multiple meridian direction refractive power measurement section measures the refractive power in one predetermined meridian direction when performing the eye accommodation function state measurement.