Visual Field Examination System Using OCT Retinal Data
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Solution Overview
Problem
Conventional visual field examination systems are inefficient as they require performing a full visual field examination without distinguishing between normal and potentially lesioned areas, and they lack the accuracy provided by three-dimensional retinal structure information from OCT devices.
Innovation Solution
A visual field examination system that uses a two-dimensional fundus image and three-dimensional retinal structure information from an OCT device to identify suspected lesion positions, allowing for targeted and efficient visual field examinations by marking specific examination points on the two-dimensional image based on three-dimensional data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a full visual field examination is performed without distinction between normal and lesioned areas, then comprehensive visual field data is obtained, but examination time is excessive and efficiency is low
Solution Approach 1:
The patent segments the visual field examination by dividing it into multiple regions based on retinal lesion locations. Instead of examining the entire visual field uniformly, the examination is divided into first examination regions (corresponding to lesion areas) and second examination regions (other areas), allowing focused measurement on suspicious areas while reducing overall examination time.
Solution Approach 2:
The patent applies local quality by setting different examination densities for different regions. The first examination regions corresponding to retinal lesions are examined with higher precision and density, while other regions are examined with lower density or skipped entirely, optimizing the allocation of examination resources based on local diagnostic needs.
2Device complexity
If only two-dimensional fundus images are used to identify lesion positions, then examination setup is simple, but accuracy in identifying suspected lesion areas is insufficient
Solution Approach 1:
The patent transitions from two-dimensional fundus images to three-dimensional OCT images for identifying lesion positions. By utilizing the depth information provided by OCT technology, the system can more accurately locate retinal lesions in three-dimensional space, improving the precision of visual field examination region selection while maintaining systematic simplicity through automated processing.
3Measurement precision
If three-dimensional OCT retinal structure information is integrated into the visual field examination system, then lesion identification accuracy is improved, but system complexity increases
Solution Approach 1:
The patent merges the OCT imaging system with the visual field examination system into an integrated platform. By combining these two functions, the system shares common components such as the optical path, scanning mechanisms, and control systems, thereby improving lesion detection accuracy while minimizing the increase in overall system complexity through resource sharing.
Solution Approach 2:
The patent introduces a control device as an intermediary that automatically processes OCT images, identifies lesion regions, and determines visual field examination regions based on the analyzed data. This intermediary component handles the complexity of integrating three-dimensional OCT information by automating the analysis and coordination between imaging and examination functions, reducing the operational burden on users.
4Ease of operation
If conventional perimeter methods are used without OCT guidance, then the system is simple to operate, but examination efficiency and targeting of suspicious areas are reduced
Solution Approach 1:
The patent implements self-service functionality where the system automatically performs lesion detection and examination region determination based on OCT images without requiring manual intervention. The control device autonomously analyzes the three-dimensional retinal structure, identifies suspicious areas, and sets up the visual field examination parameters, allowing the system to serve itself in the complex tasks of image analysis and examination planning while maintaining ease of operation.
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 enables accurate and time-efficient visual field examinations by using three-dimensional retinal structure information to identify and focus on areas suspected of having abnormalities, reducing the need for full-range examinations.
Implementation Method 1
there are also known devices such as an OCT (Optical Coherence Tomography) capable of measuring the layer thickness of the retina of an eye under examination
Implementation Method 2
light is projected onto the fundus, and light reflected therefrom is detected to acquire a three-dimensional image indicative of the morphology of the retina
Data Source
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AI summary
A stimulus is presented at a predetermined position of a visual field coordinate system set on a visual field dome (118). When measuring the visual field of an eye under examination, quantitative information of a three-dimensional retinal layer structure is acquired that is obtained by means for detecting a range of disappearance of a peak in the reflectance distribution of the retina obtained by a retinal OCT scan. The position of the fovea of the fundus is identified from the three-dimensional retinal layer structure. From the positional relationship with the identified fovea, it is identified to which position in a two-dimensional fundus image the range of disappearance of the peak corresponds. The position corresponding to the range where the peak disappears is marked on the two-dimensional fundus image, and the marked region is detected. A visual field examination region including visual field examination points to be presented on the visual field dome is generated on the basis of the position of the marked region. The visual field examination points in the visual field examination region are presented to the subject using the visual field dome to perform a visual field examination for the eye under examination.