Ocular Fundus Imaging With Adaptive Angle-of-View Control
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Solution Overview
Problem
Existing fundus imaging devices struggle to capture high-quality images of the eye fundus at different angles of view due to changes in optical features other than the angle of view, leading to clinically low-priority or unusable images.
Innovation Solution
A fundus imaging device with an angle-of-view switching unit and control unit that adjusts imaging conditions, including light intensity, diopter correction, and focus control, to maintain image quality before and after switching angles of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the angle of view is switched between narrow and wide, then the imaging range is changed, but other optical features (light intensity, focus position, diopter) change causing degraded image quality
Solution Approach 1:
The control unit automatically adjusts multiple optical parameters (light intensity, focus position, diopter correction) in response to angle-of-view switching. When the angle of view changes, the system changes the intensity of light, the focus position, and diopter correction values to compensate for optical feature changes, thereby maintaining consistent image quality across different imaging ranges.
Solution Approach 2:
The system incorporates feedback control where the control unit monitors the angle-of-view switching events and automatically adjusts optical parameters based on pre-stored correspondence relationships. This feedback mechanism ensures that optical features are continuously optimized according to the current imaging mode, preventing image quality degradation.
2Adaptability or versatility
If multiple imaging methods are combined, then imaging versatility is improved, but the clinical usefulness and image quality remain insufficient
Solution Approach 1:
The control unit stores correspondence relationships between imaging modes and optimal optical parameters. When a specific imaging mode is selected, the system automatically adjusts light intensity, focus position, and diopter correction values to match the optimal parameters for that mode, ensuring high image quality and clinical usefulness for each imaging method.
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
Enables high-quality imaging of the fundus at both narrow and wide angles of view by optimizing light intensity, diopter correction, and focus control, ensuring clinically meaningful images are obtained in both modes.
Implementation Method 1
an imaging optical system that images the fundus of a subject eye based on return light from the fundus
Implementation Method 2
a focus lens configured to focus a measuring light on the object to be inspected
Data Source
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AI summary
The purpose of the present invention is to favorably capture an image of an ocular fundus in both forward/rearward directions for switching viewing angle. The present invention is provided with: imaging optical systems 100, 200 which capture an ocular fundus of a subject eye E on the basis of return light from the subject eye E by irradiating the ocular fundus of the subject eye E with light via objective optical systems 320, 330 while scanning units 134, 216 scan light from light sources 102, 211; and a control unit 70 which switches a viewing angle in the imaging optical systems 100, 200 between a first viewing angle and a second viewing angle larger than the first viewing angle by switching the objective optical systems 320, 330,and which switches between a first mode in which the ocular fundus is image-captured at a first viewing angle and a second mode in which the ocular fundus is image-captured at a second viewing angle. Furthermore, the control unit 70 switches the photographing conditions of the imaging optical systems 100, 200 between the first mode and the second mode.