Eye Examination Device Fixation Guidance with an Intermediate Light Source
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional eye examination devices face issues where the default light sources may fall outside the visual range of the subject's eye during adjustments, requiring significant eye rotation, which needs improvement.
Innovation Solution
The introduction of a dummy light source between the default light sources to guide eye movement, switching to this source during distance changes, and back to default sources when stable, minimizing large-angle rotations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the eye examination device moves closer to the subject's eye to adjust distance, then the detection capability is improved, but the default light sources fall outside the visual range requiring large eye rotation
Solution Approach 1:
A dummy light source is introduced as an intermediary between the first and second default light sources. During device movement when default light sources fall outside visual range, the dummy light source acts as a mediator to guide the subject's eye, preventing excessive eye rotation while maintaining detection capability.
Solution Approach 2:
The system dynamically switches between different light sources based on device position. When distance changes occur, the dummy light source is activated; when distance is stable, the default light sources are used. This dynamic adaptation resolves the contradiction between maintaining detection precision and ease of operation.
2Productivity
If the distance between eye examination device and subject's eye is shortened, then the examination efficiency is improved, but the subject's eye must turn a considerable angle
Solution Approach 1:
The dummy light source serves as a mediator during distance adjustment phases, allowing the device to move closer for efficient examination while the dummy light source prevents harmful large-angle eye rotations by providing an intermediate visual target.
Solution Approach 2:
The dummy light source is positioned and activated in advance during distance change phases to prevent the harmful effect of large eye rotations before they occur, allowing efficient close-distance examination without eye strain.
3Ease of operation
If dummy light source is used during distance change, then eye rotation is minimized, but device complexity increases
Solution Approach 1:
The dummy light source is a simple intermediary element positioned between existing default light sources. It adds minimal complexity while effectively controlling eye rotation during distance changes, as it only requires optical placement and conditional activation.
Solution Approach 2:
The system uses dynamic conditional activation of the dummy light source based on distance change detection. This approach minimizes overall device complexity by only engaging the additional light source when needed, rather than requiring complex mechanical or optical systems.
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
Prevents excessive eye rotation by ensuring continuous visual alignment with light sources, maintaining effective eye examination despite device proximity adjustments.
Implementation Method 1
a first default light source LS1 and a second default light source LS2. The guiding fixation method includes steps of: (a) disposing at least one dummy light source DM between the first default light source LS1 and the second default light source LS2; (b) when a distance between the eye examination device and an eye changes, the dummy light source emitting light to guide the eye to gaze at the dummy light source
Data Source
AI summary
A guiding fixation method applied to an eye examination device includes a first light source and a second light source. The guiding fixation method includes disposing a third light source between the first light source and the second light source, when a distance between the eye examination device and an eye changes, the third light source emitting light to guide the eye to gaze at the third light source, and when the distance between the eye examination device and the eye stops changing, switching to the first light source and/or the second light source to emit light to guide the eye to gaze at the first light source and/or the second light source.