Fundus Imaging Diopter Correction Artifact Suppression
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Solution Overview
Problem
Fundus imaging apparatuses with wider angles of view suffer from artifacts caused by reflection light at the lens surface, leading to deteriorated image quality, particularly due to the increased sensitivity of spectrum interference signals and the peak occurrence of artifacts at specific diopter values.
Innovation Solution
The fundus imaging apparatus incorporates a diopter correction unit with a drive range set to avoid the peak portion of artifact intensity, using an optical element and drive unit to perform diopter corrections, thereby suppressing artifacts by restricting the drive range of the optical element to exclude the peak portion related to the objective lens system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the diopter correction unit allows a wider range of diopter values to accommodate more subject eyes, then the adaptability to different eyes is improved, but artifacts caused by reflection light at the lens surface become more problematic and image quality deteriorates
Solution Approach 1:
The patent changes the parameter of drive range for the optical element in the diopter correction unit. By restricting the drive range to exclude the specific diopter value range where reflection artifacts are maximized (peak portion), the system maintains adaptability while suppressing harmful artifacts. This is achieved by defining a drive range that avoids the problematic diopter values where the imaging surface is conjugate to the lens surface or curvature central face.
2Area of stationary object
If the angle of view of the imaging optical system is increased to capture more fundus area, then the coverage area is improved, but the sensitivity of spectrum interference signals increases making artifacts more prominent
Solution Approach 1:
The patent applies parameter changes by adjusting the drive range of the diopter correction unit's optical element. This parameter adjustment ensures that even when the angle of view is increased to capture more fundus area, the system avoids diopter values that would maximize reflection artifacts. The drive range is specifically set to exclude the peak portion where artifacts occur, thereby maintaining image quality across wider fields of view.
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 approach effectively suppresses artifacts caused by reflection light, improving image quality by adjusting the drive range of the optical element to prevent overlap with the peak portion, even at wider angles of view, ensuring favorable fundus image capture.
Implementation Method 1
an optical element disposed on an optical path of the imaging optical system and a drive unit driving the optical element, and performs a diopter correction with a diopter value corresponding to a drive amount of the optical element
Implementation Method 2
an imaging optical system that irradiates a fundus of a subject eye with light through an objective lens system, and enables to capture a fundus image of the subject eye based on return light from the subject eye
Implementation Method 3
an artifact caused by reflection at the lens surface tends to occur on a fundus image
Data Source
AI summary
A fundus imaging apparatus includes an imaging optical system that irradiates a fundus of a subject eye with light through an objective lens system, and enables to capture a fundus image of the subject eye based on return light from the subject eye, and a diopter correction unit that includes an optical element disposed on an optical path of the imaging optical system and a drive unit driving the optical element, and performs a diopter correction with a diopter value corresponding to a drive amount of the optical element. A drive range of the optical element in the diopter correction unit is set to avoid a specific range being a range in which an artifact caused by reflection light in the objective lens system is maximized.