Dynamic Display Magnification for Ophthalmic Alignment
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Solution Overview
Problem
Conventional fundus cameras with small display units face difficulties in accurately aligning the eye for examination due to inadequate display magnification, leading to increased time and reduced accuracy in alignment and focus adjustment, especially when switching between anterior ocular and fundus image observation modes.
Innovation Solution
An ophthalmic apparatus and image processing method that dynamically adjust the display magnification based on the observation mode and operation, using an image processing unit to display images at appropriate magnifications for each observation state, allowing for improved alignment and focus adjustment by optimizing the display of anterior ocular and fundus images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display unit size is kept small, then the portability and compactness are improved, but the alignment accuracy and observation quality deteriorate
Solution Approach 1:
The patent applies dynamic display magnification adjustment based on the observation mode. The display magnification is automatically changed according to whether the system is in anterior ocular observation mode or fundus observation mode, allowing the small display unit to show appropriately sized images for each function without requiring a larger physical display.
Solution Approach 2:
The system changes the display magnification parameter dynamically. In anterior ocular observation mode, a first display magnification is applied, while in fundus observation mode, a second display magnification is applied. This parameter change allows the same small display unit to effectively display different types of images at appropriate sizes.
2Measurement precision
If the display magnification is increased for anterior ocular observation, then the alignment accuracy is improved, but the imaging range is narrowed and time to grasp eye position increases
Solution Approach 1:
The display magnification is dynamically adjusted based on the observation mode. When in anterior ocular observation mode, the system applies a specific display magnification that is optimized for that function, rather than using a fixed high magnification that would narrow the field of view.
3Measurement precision
If the display magnification is adjusted for fundus observation, then the fundus image quality is improved, but the anterior ocular segment image size is reduced
Solution Approach 1:
The system dynamically switches display magnification based on the active observation mode. When observing the fundus, a second display magnification is applied to ensure proper fundus image quality, while when observing the anterior ocular segment, a first display magnification is applied to maintain appropriate image size.
4Device complexity
If a fixed display magnification is used, then the device complexity is reduced, but the alignment time and operational efficiency increase
Solution Approach 1:
The display magnification is automatically adjusted based on the observation mode without requiring complex manual intervention. The system dynamically selects the appropriate magnification level based on whether anterior ocular or fundus observation is active, improving efficiency while maintaining manageable system complexity.
Data Source
AI summary
A ophthalmic apparatus includes: an imaging unit configured to obtain, through a photographing optical system, an image of an eye to be examined which is illuminated with illumination light from an observation light source of an illumination optical system; a display unit configured to display the image obtained by the imaging unit; and an image processing unit configured to display an image of the eye on the display unit at a display magnification corresponding to an observation portion of the eye or a display magnification corresponding to operation of the imaging unit.