Ophthalmic Fixation Light Synchronization for Stable Eye Guidance
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Solution Overview
Problem
Existing ophthalmic devices face limitations in the installation of fixation optical systems due to the movement of fixation targets during scanning, which affects the accuracy and stability of eye orientation guidance.
Innovation Solution
The ophthalmic device incorporates a scanning optical system with a fixation light source and a synchronized fixation light scanning section that ensures the fixation target remains stationary relative to the eye during scanning, using synchronized drive signals to maintain the fixation target's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixation optical system is installed in an ophthalmic device with a scanning system, then eye orientation guidance can be provided, but the fixation target moves during scanning which reduces guidance accuracy
Solution Approach 1:
The patent implements a dynamic compensation mechanism where a fixation light scanning section scans the fixation light in synchronization with the scanning optical system. This dynamic approach allows the fixation target to be continuously repositioned to compensate for movements caused by the scanning optical system, maintaining guidance accuracy throughout the scanning process.
Solution Approach 2:
The system uses synchronized scanning control where the fixation light scanning section receives control signals based on the scanning optical system's operation. This feedback mechanism ensures that the fixation target position is continuously adjusted in real-time to counteract scanning-induced movements, preserving measurement precision.
2Measurement precision
If the fixation target is kept stationary during scanning, then guidance accuracy is maintained, but the field of view coverage is limited
Solution Approach 1:
By implementing synchronized scanning of the fixation light along with the imaging light, the system dynamically adjusts the fixation target position to match the scanning progression. This allows the examination to cover a wide field of view while the fixation target remains effectively stationary relative to the examined eye at each position, resolving the contradiction between coverage area and position stability.
Solution Approach 2:
The fixation light is pre-scanned to appropriate positions before imaging at each location. This preliminary positioning ensures that the fixation target is already in the correct position when imaging begins, allowing the eye to be properly oriented before the actual examination, thus maintaining both wide coverage and precise guidance.
3Ease of operation
If multiple light sources are used for fixation targets, then eye orientation guidance can be provided during scanning, but the system complexity increases
Solution Approach 1:
The patent combines the fixation light scanning function with the existing scanning optical system by using the same scanning mechanism and control infrastructure. Rather than adding completely separate fixation target systems, the invention merges the fixation light path with the imaging light path, using synchronized control to achieve eye orientation guidance without proportionally increasing system complexity.
Data Source
AI summary
An ophthalmic device including a scanning optical system configured to scan an examined eye with light from a light source, a fixation light source configured to illuminate fixation light onto the examined eye through the scanning optical system so as to function as a fixation target, and a fixation light scanning section configured to scan the fixation light synchronized to scanning of the scanning optical system such that an illuminated fixation target does not move a specific distance or greater due to scanning of the scanning optical system.