Perimeter Stimulus Presentation for Visual Field Inspection
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Solution Overview
Problem
Conventional perimetry methods take longer to conduct on the whole visual field, causing a heavy burden on patients and examiners, and are influenced by examinees predicting the stimulus presentation region, leading to incorrect inspection results.
Innovation Solution
A perimeter system that designates a region for perimetry inspection, presents stimuli to both the inspection region and a spaced region, with varying brightness and density, to prevent prediction and ensure accurate results, while allowing for shorter inspection times and detailed analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If perimetry is conducted on the whole visual field, then comprehensive inspection coverage is achieved, but inspection time increases and burden on patients increases
Solution Approach 1:
The visual field inspection is segmented into two distinct regions: the inspection region (where perimetry is primarily focused) and the spaced region (surrounding area). This segmentation allows the system to concentrate stimuli presentation on specific zones rather than uniformly covering the entire visual field, thereby reducing overall inspection time while maintaining comprehensive monitoring capability.
Solution Approach 2:
Different regions of the visual field are assigned different functional qualities: the inspection region receives higher-density stimulus presentation for detailed analysis, while the spaced region receives lower-density presentation for broader monitoring. This local differentiation optimizes the balance between inspection thoroughness and time efficiency.
2Loss of time
If perimetry is conducted only on a designated region, then inspection time is reduced, but patients may predict stimulus presentation locations leading to incorrect results
Solution Approach 1:
The system extends the stimulus presentation from a single designated inspection region into a second spatial dimension by incorporating the spaced region. This dimensional expansion creates unpredictable stimulus locations, preventing patients from anticipating where stimuli will appear while still maintaining focused inspection on the primary region.
Solution Approach 2:
The spaced region is pre-configured as part of the stimulus presentation strategy before the examination begins. By having this additional region ready for stimulus presentation, the system prevents prediction without requiring extensive additional inspection time, as the preventive measure is already in place.
3Measurement precision
If stimuli are presented to both inspection region and spaced region, then prediction by patients is prevented, but device complexity increases
Solution Approach 1:
The system dynamically adjusts stimulus presentation based on the defined regions, using programmable control to manage the complexity of presenting stimuli to both the inspection region and spaced region. This dynamic control allows the system to handle multiple regions without requiring proportionally increased hardware complexity, as the management is achieved through software-based region determination and stimulus coordination.
Data Source
AI summary
In a perimetry to be conducted, designating an inspection region through a region designator, stimuli are presented to regions separated in an up/down direction, an oblique direction and a right/left direction from the inspection region (“the spaced region”) in addition to the designated inspection region. At the result, examinees are not able to predict to which of both regions, the inspection region and the spaced region the stimuli are presented, thereby obtaining correct inspection results that do not receive a prediction of the examinees.