Ophthalmologic Apparatus 3D Eye Position Adjustment
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Solution Overview
Problem
Conventional ophthalmologic apparatuses face challenges in achieving precise position adjustment between the optical system and the eye, particularly in the z-direction, leading to reduced accuracy and reproducibility of examinations, often requiring additional dedicated sensors.
Innovation Solution
An ophthalmologic apparatus that includes an examination optical system, a drive part, two or more imaging parts for simultaneous anterior segment photography, an analyzer for obtaining three-dimensional eye position, storage for correction information based on optical properties, and a position corrector to adjust the optical system's position accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If different methods are used for position adjustment in xy direction and z direction, then the complexity of the adjustment system is reduced, but the measurement precision and reproducibility of examination are degraded
Solution Approach 1:
The patent merges the position detection functions for both xy direction and z direction into a single imaging device. The imaging device captures images from which both lateral (xy) and axial (z) position information are extracted, eliminating the need for separate sensors and achieving unified position adjustment with improved measurement precision.
2Measurement precision
If a dedicated sensor is added for z direction position adjustment, then the measurement precision in z direction is improved, but the device complexity and cost increase
Solution Approach 1:
The imaging device is designed to serve multiple functions: it simultaneously performs xy position detection and z position detection. By extracting different types of position information from the same captured images, the system achieves multi-functionality without adding dedicated sensors, thereby maintaining measurement precision while reducing device complexity.
Solution Approach 2:
The imaging device serves itself by extracting both lateral and axial position information from its own captured images. The system uses the imaging data to determine the eye's position in three dimensions without requiring external or dedicated sensing mechanisms,实现ing self-service position detection.
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-precision and accurate position adjustment between the optical system and the eye, eliminating the need for additional sensors and improving the reproducibility of examinations.
Implementation Method 1
two or more imaging parts configured to substantially simultaneously photograph an anterior segment of the eye from different directions
Data Source
AI summary
An ophthalmologic apparatus includes an examination optical system, drive part, two or more imaging parts, analyzer, storage, position corrector, and controller. The examination optical system examines an eye. The drive part moves the examination optical system. The imaging parts substantially simultaneously photograph the anterior segment of the eye from different directions. The analyzer analyzes two or more photographic images captured substantially simultaneously by the imaging parts to obtain a three-dimensional position of the eye. The storage stores correction information in advance. The correction information is acquired based on optical properties of eyeballs, and used to correct the position of the eye in the optical axis direction of the examination optical system. The position corrector corrects the three-dimensional position obtained by the analyzer based on the correction information. The controller controls the drive part based on the three-dimensional position corrected to move the examination optical system.