Ophthalmological Device Subject Detection via Illumination Brightness Difference
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Solution Overview
Problem
Conventional ophthalmological devices require special-purpose circuits for detecting subjects, which are not directly related to ophthalmological examinations, making them inefficient for determining subject presence and alignment during eye examinations.
Innovation Solution
An ophthalmological device comprising a support structure, illumination light source, observation optical system, and controller that captures images with and without illumination, determining subject presence based on brightness differences and aligns the observation optical system with the subject's eye using a driving system for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If special-purpose circuits are used for detecting subjects, then subject detection function is achieved, but device complexity increases
Solution Approach 1:
The illumination light source and observation optical system originally designed for ophthalmological examinations are made to serve dual purposes: performing eye examinations and detecting subject presence/alignment. By capturing images with the imaging element during normal examination operations, the system extracts subject detection information from the same optical path without requiring separate detection hardware, thus achieving multi-functionality and reducing device complexity.
2Adaptability or versatility
If separate detection systems are added, then subject presence detection is improved, but ease of operation deteriorates
Solution Approach 1:
The subject detection function is merged with the existing ophthalmological examination system by utilizing the same illumination light source, observation optical system, and imaging element. The controller integrates subject presence determination and alignment detection into the existing examination workflow, allowing operators to perform both functions through a single unified system rather than managing separate detection devices, thereby improving 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
Enables efficient detection of subject presence and automatic alignment of the observation optical system with the eye, reducing examination time and burden on examiners while utilizing existing ophthalmological structures without additional special hardware.
Implementation Method 1
The illumination light source is configured to illuminate a subject's eye. The observation optical system comprises an imaging element configured to receive light reflecting off the subject's eye.
Implementation Method 2
The controller is configured to determine whether the subject's face is placed on the support structure based on a difference in brightness between the first image and the second image.
Data Source
AI summary
An ophthalmological device according to one aspect of the present disclosure includes a support structure, an illumination light source, an observation optical system, and a controller. The support structure is configured to support a subject's face. The illumination light source is configured to illuminate a subject's eye. The observation optical system includes an imaging element configured to receive light reflecting off the subject's eye. The controller is configured to acquire, from the imaging element, a first image captured when the illumination light source is on and a second image captured when the illumination light source is off and determine whether the subject's face is placed on the support structure based on a difference between the first image and the second image.