Ophthalmologic Apparatus Eye State Detection
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Solution Overview
Problem
Existing ophthalmologic apparatuses struggle to accurately determine if an eye is in an examinable state, especially when the eye is dry, opaque, or of an irregular shape, due to low light intensity from the cornea surface, leading to incomplete or inaccurate examinations.
Innovation Solution
An ophthalmologic apparatus that acquires a two-dimensional cross-sectional image in the vertical and depth directions of the eye, allowing determination of whether the eye is blocked by eyelids or lashes, and thus assesses its examinable state, using an optical measurement system and imaging device to position the optical measurement system relative to the eye and determine if specific areas of the image contain structural features, such as the iris and conjunctiva.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light intensity from the cornea surface is used to determine eyelid opening state, then the determination method is simple, but the accuracy deteriorates when the eye is dry, opaque, or irregularly shaped
Solution Approach 1:
The patent transitions from using a single light intensity parameter (one-dimensional) to acquiring two-dimensional cross-sectional images of the eye. This dimensional change allows the system to capture structural information about the iris and conjunctiva, enabling accurate determination of eyelid opening state even when corneal light reflection is insufficient due to dryness, opacity, or irregular shape.
2Measurement precision
If two-dimensional cross sectional image acquisition is implemented, then determination accuracy is improved, but device complexity increases
Solution Approach 1:
The patent employs an optical measurement system that serves multiple functions: it acquires two-dimensional cross-sectional images for examinable state determination, performs eye examinations, and provides structural information for diagnosis. This multi-functionality reduces the need for separate dedicated imaging devices, thereby mitigating the increase in device complexity while maintaining high determination accuracy.
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 accurate determination of the eye's examinable state, preventing failed examinations and providing a warning when the eye is not in an examinable state, even when the eye is dry, opaque, or irregularly shaped, by using a two-dimensional cross-sectional image to assess blockages and structural presence.
Implementation Method 1
an optical measurement system that radiates measurement light to an eye to be examined... an imaging unit that takes a cross sectional image of the eye by using reflected light of the measurement light from the eye
Data Source
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AI summary
An ophthalmologic apparatus comprises an optical measurement system that radiates measurement light to an eye to be examined, an imaging unit that takes a cross sectional image of the eye by using reflected light of the measurement light from the eye, and a controller that controls the optical measurement system and the imaging unit. When the optical measurement system is positioned at a measurement position, the controller obtains a two-dimensional cross sectional image by the imaging device. One axis of the two-dimensional cross sectional image extends in a vertical direction of the eye, and another axis of the two-dimensional cross sectional image extends in a depth direction of the eye. The controller determines whether the eye is in an examinable state or not based on the two-dimensional cross sectional image.