Fundus Camera Multi-Wavelength Retinal Layer Imaging
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Solution Overview
Problem
Conventional fundus cameras are unable to image different layers of the retina effectively, limiting the valuable medical and diagnostic data that can be obtained.
Innovation Solution
The fundus camera incorporates an illumination module with multiple light sources emitting different wavelengths, a main optical assembly with a ring reflector and anti-reflection coated objective lenses, and an image sensing acquisition module, allowing for the imaging of various retinal layers by varying the wavelengths of light penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional fundus cameras use single-wavelength white light for illumination, then the device complexity is low and ease of operation is maintained, but the ability to image different layers of the retina is lost
Solution Approach 1:
The illumination system is segmented into multiple independent light sources, each emitting a specific wavelength range. This allows selective activation of individual wavelengths to target specific retinal layers, transforming a single-function illumination system into a multi-functional one capable of depth-resolved imaging.
Solution Approach 2:
The patent changes the wavelength parameter of the illumination light to achieve different imaging depths. By varying the wavelength (e.g., blue light for superficial layers, red light for deeper layers), the system can selectively image different retinal layers without changing the physical structure of the camera.
2Measurement precision
If multiple light sources with different wavelengths are used, then wavelength-dependent retinal layer imaging is enabled, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The optical system is designed with universal components that can handle multiple wavelengths. The objective lens and ring reflector are configured to work across the visible spectrum, allowing the same optical path to serve both illumination and imaging functions for multiple wavelengths, thereby reducing manufacturing complexity despite the multi-wavelength requirement.
Solution Approach 2:
The ring reflector acts as an intermediary component that efficiently directs different wavelength ranges through the same optical path. It mediates between the multiple light sources and the objective lens, enabling wavelength-multiplexed imaging without requiring separate optical paths for each wavelength.
3Use of energy by moving object
If anti-reflection coating is applied to objective lens, then light transmission efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The objective lens employs composite material structure with anti-reflection coating applied on the lens surface. This composite structure reduces reflection losses across the visible spectrum, improving light transmission efficiency. The coating process, while requiring precision, is a standard industrial technique that balances performance gains with manufacturing feasibility.
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
This configuration enables the imaging of different retinal layers based on wavelength, providing valuable medical and diagnostic data by utilizing the spectrum-dependent reflection and absorption properties of the retina.
Implementation Method 1
the ring reflector is arranged obliquely. The illumination light emitted by the illumination module is reflected to the objective lens by the ring reflector
Implementation Method 2
illumination light emitted by the plurality of light sources is conducted to enter an eye of a patient through the main optical assembly
Implementation Method 3
optical lenses in the at least one lens group are all coated with anti-reflection coating
Implementation Method 4
different wavelengths penetrate the retina at different depths, so that different layers of the retina at different depths can be imaged
Data Source
AI summary
Disclosed is a fundus camera, which relates to the technical field of medical devices and includes: an illumination module, a main optical assembly, a focusing module, and an image sensing acquisition module; the illumination module includes a plurality of light sources configured to emit light of different wavelengths, illumination light emitted by the plurality of light sources is conducted to enter an eye of a patient through the main optical assembly, and light reflected by a retina of the patient is conducted to pass through the main optical assembly and the focusing module to enter the image sensing acquisition module. The fundus camera provided by the present application improves the technical problem that the fundus camera in the prior art cannot image different layers of the retina, thereby providing valuable medical and diagnostic data.