Ophthalmologic Apparatus Closed-Loop Eye Characteristic Control
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Solution Overview
Problem
Conventional ophthalmologic apparatuses cannot automatically adjust their operation based on the changing conditions of a subject's eye after stimulation, lacking the ability to reflect eye characteristics in their control mechanisms.
Innovation Solution
An ophthalmologic apparatus incorporating a target projection system and an objective measurement optical system, which presents a target to the subject's eye and objectively measures eye characteristics, allowing for automatic control adjustments based on these measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional ophthalmologic apparatus performs manual operation control, then operator flexibility is maintained, but automation level and measurement efficiency are insufficient
Solution Approach 1:
The control portion receives measurement results from the objective measurement optical system and automatically adjusts presentation conditions (position, time, type of target) based on this feedback. This creates a closed-loop system where measurement results directly influence subsequent presentation parameters, achieving automation without requiring complex manual intervention while maintaining appropriate system complexity.
Solution Approach 2:
The apparatus performs self-adjustment of presentation conditions based on automatic measurement of eye characteristics. The system serves itself by automatically modifying its own operation parameters (target position, presentation time) according to real-time measurement data, eliminating the need for external operator control while keeping the system relatively simple.
2Measurement precision
If the apparatus measures eye characteristics in real-time during target presentation, then measurement accuracy and responsiveness improve, but measurement time and processing load increase
Solution Approach 1:
The objective measurement optical system continuously or repeatedly measures eye characteristics during the target presentation period rather than taking single discrete measurements. This continuous measurement approach improves accuracy by capturing dynamic eye responses while the target is actually being viewed, and the automation allows this to occur without proportionally increasing total measurement time.
Solution Approach 2:
The system performs preliminary measurement of baseline eye characteristics before target presentation, then uses these baseline values to automatically adjust presentation conditions. This preliminary action allows the system to prepare appropriate measurement parameters in advance, improving subsequent measurement accuracy without adding significant time overhead.
Data Source
AI summary
An ophthalmologic apparatus includes a target projection system that presents an eye chart to a subject eye, an objective measurement optical system that objectively measures an eye characteristic of the subject eye, and a control portion that controls the target projection system and the objective measurement optical system, wherein the control portion presents the target for a predetermined time at a predetermined presentation position with the target projection system, and objectively measures the eye characteristic with the objective measurement optical system in a time series to control an operation of each portion based on a measurement result of the objective measurement.