Dynamic Fogging Ophthalmologic Apparatus for Accommodation Relaxation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ophthalmologic apparatuses face challenges in properly relaxing the accommodation of subject eyes, particularly in children and individuals with pseudomyopia, as the accommodation of crystalline lenses remains tense even during distance vision, making it difficult to fully relax the eyes using fixed fixation target presentation positions.
Innovation Solution
An ophthalmologic apparatus with an objective measurement optical system and an optotype projection system that adjusts the presentation position of the fixation target to increase the amount of fog, allowing for objective measurement of eye characteristics over time, enabling proper relaxation of the accommodation by dynamically changing the fog application based on the objective examination results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed presentation position of the fixation target is used, then the examination procedure is simple, but the accommodation of the subject eye cannot be properly relaxed in cases of pseudomyopia
Solution Approach 1:
The fixation target presentation position is changed dynamically during the examination. The controller automatically adjusts the presentation position multiple times to progressively relax the accommodation of the crystalline lens, transforming a static fixed-position system into a dynamic adaptive system that responds to the subject's accommodation state.
Solution Approach 2:
The presentation position parameter of the fixation target is systematically changed during the examination. By varying this parameter (position) in a controlled manner, the system achieves progressive fogging and accommodation relaxation, allowing reliable measurement even in pseudomyopia cases where fixed positioning fails.
2Reliability
If the presentation position of the fixation target is changed multiple times to increase fog amount, then the accommodation relaxation becomes effective, but the examination time increases
Solution Approach 1:
The system performs self-adjustment through automatic controller operation. The controller autonomously manages the multiple presentation position changes and timing without requiring manual intervention, reducing operational overhead and minimizing the time penalty despite the increased number of measurement cycles.
Solution Approach 2:
The system uses feedback from spherical power measurements to determine when accommodation relaxation is sufficient. The controller monitors changes in spherical power across different presentation positions and automatically concludes the fogging process when convergence is detected, optimizing examination time based on real-time physiological feedback.
3Reliability
If fogging is applied to relax accommodation, then the crystalline lens tension is relieved, but the spherical power measurement becomes more difficult
Solution Approach 1:
The system performs preliminary measurements at the initial presentation position before changing to subsequent positions. This preliminary spherical power measurement establishes a baseline that facilitates accurate tracking of accommodation changes and enables precise determination of the relaxed state through convergence detection.
Data Source
AI summary
An ophthalmologic apparatus includes an objective measurement optical system that is configured to objectively measure eye characteristics of a subject eye; an optotype projection system that is configured to present a fixation target to the subject eye at a predetermined presentation position and apply fog to the subject eye; and a controller that is configured to control the objective measurement optical system and optotype projection system. The controller is further configured to objectively measure the eye characteristics over time by changing a presentation position of the fixation target from the predetermined presentation position in a direction to increase an amount of fog and presenting the fixation target.