Fundus Observation Device Fixation Target Projection Alignment
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Solution Overview
Problem
Conventional fundus observation devices face challenges in easily capturing images at the desired position on the fundus oculi, particularly due to difficulties in fixing the eye to align the desired position with the optical axis, leading to suboptimal image quality and capture issues, especially when imaging peripheral regions.
Innovation Solution
A fundus observation device equipped with a fixation target projecting system that includes a display and a projection optical system to project a fixation target onto the fundus oculi, allowing for adjustment of the projection position and enabling easy alignment of the eye for precise image capture, combined with an imaging system that forms 2-dimensional images based on optically captured data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional fundus observation devices are used without a projection optical system, then the device structure remains simple, but it becomes difficult to align the eye and capture images at desired positions on the fundus oculi
Solution Approach 1:
A projection optical system is introduced as an intermediary component between the display and the fundus oculi. This projection optical system projects the fixation target onto the fundus oculi, serving as a mediator that guides eye alignment without requiring direct mechanical interaction with the patient's eye, thus improving ease of operation while maintaining reasonable device complexity
Solution Approach 2:
The patent replaces traditional mechanical alignment methods with an optical projection system. Instead of using mechanical devices to physically guide or constrain the eye, the system uses optical projection of a fixation target to guide the patient's gaze, substituting mechanical alignment with optical guidance
2Adaptability or versatility
If the projection position of the fixation target is fixed, then the optical system remains simple, but it becomes difficult to capture images at different positions on the fundus oculi
Solution Approach 1:
The projection optical system is designed with adjustable components that allow dynamic changing of the projection position on the fundus oculi. This enables the system to adapt to different imaging requirements (central retina, peripheral retina, etc.) by dynamically repositioning the fixation target projection without requiring complete redesign of the optical system
Solution Approach 2:
The projection optical system is designed to serve multiple functions: it can project fixation targets at different positions on the fundus oculi, accommodate different types of fundus examinations (central and peripheral), and work with different imaging configurations. This multi-functionality achieves adaptability while avoiding the need for separate specialized systems for each function
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
Facilitates easy alignment and capture of images at desired positions on the fundus oculi, improving image quality and ease of use by allowing for precise adjustment of the fixation target projection, thereby overcoming the limitations of traditional fixation methods.
Implementation Method 1
projection optical system configured to project the displayed fixation target onto the fundus oculi
Data Source
AI summary
LCD 140 is provided for displaying an internal fixation target for fixating an eye E. Projection optical system (a part of an imaging optical system 120) is provided for projecting the displayed internal fixation target onto the a fundus oculi Ef. Image forming part 220 is provided for forming 2-dimensional images (images of fundus oculi) Ef of the surface of fundus oculi Ef. Display part 240A is provided for displaying images of fundus oculi Ef. Operation part 240B is provided for specifying the position of the displayed images of fundus oculi Ef. Main controller 211 is provided for changing the projection position of the internal fixation target on the fundus oculi by changing the display position of the fixation target by the LCD 140 based on the specified position. The image forming part 220 forms tomographic images of the fundus oculi Ef with the internal fixation target projected.