Head-Mountable Oculomotor Assessment With Mechanical Depth Stimulus
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Solution Overview
Problem
Existing oculomotor assessment technologies, particularly those using augmented and virtual reality systems, face challenges in providing a controlled, distraction-free environment for accurate cognitive impairment testing, often relying on 2D displays that simulate depth cues and lacking in perceived depth quality and resolution, leading to user fatigue and nausea.
Innovation Solution
A head-mountable device with a mechanically displaceable oculomotor stimulus and an actuation mechanism that presents the stimulus relative to the user, combined with an eye tracking system, allowing for 1D, 2D, or 3D assessments without the need for complex light field generation, providing a controlled environment for oculomotor response evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 2D displays are used to simulate depth cues in augmented and virtual reality systems, then the assessment environment can be controlled, but the perceived depth quality and resolution deteriorate, leading to user fatigue and nausea
Solution Approach 1:
The patent transitions from 2D display technology to 3D stereoscopic display technology, adding the depth dimension to the visual stimulus presentation. This allows the system to provide genuine depth perception rather than simulated depth cues, thereby improving perceived depth quality and resolution while reducing user fatigue and nausea associated with fake depth simulation.
Solution Approach 2:
The patent uses stereoscopic images that copy and replicate real-world 3D depth perception by presenting slightly different images to each eye. This copying of natural visual perception mechanisms allows the system to achieve authentic depth quality without the harmful effects of simulated depth in 2D displays.
2Measurement precision
If complex light field generation is used to provide 3D assessment capabilities, then perceived depth quality improves, but device complexity increases
Solution Approach 1:
Instead of generating complex light fields, the patent uses stereoscopic images that copy and replicate 3D depth perception by presenting slightly different images to each eye. This approach achieves authentic depth quality through a simpler implementation compared to complex light field generation systems.
Solution Approach 2:
The patent replaces complex mechanical light field generation systems with a more straightforward stereoscopic display approach. By substituting the complex optical field generation mechanism with image-based depth simulation, the system achieves similar or better depth perception with reduced device complexity.
3Measurement precision
If mechanically displaceable oculomotor stimulus is used, then assessment accuracy improves, but device complexity increases
Solution Approach 1:
The mechanically displaceable stimulus serves multiple functions: it provides 3D visual stimuli for depth perception assessment, enables controlled movement for oculomotor testing, and can present various target configurations. This multi-functionality justifies the added mechanical complexity by delivering comprehensive assessment capabilities through a single integrated mechanism.
Solution Approach 2:
The patent incorporates mechanical displacement capability to dynamically move the oculomotor stimulus in three-dimensional space. This dynamic adjustment allows the system to present stimuli at various distances and positions, enabling accurate assessment of oculomotor responses to changing visual targets, thereby improving measurement precision despite increased device complexity.
Data Source
AI summary
A head-mountable device for performing an oculomotor assessment of a user. the head-mountable device comprising a mechanically displaceable oculomotor stimulus. an actuation mechanism operable to displace the mechanically displaceable oculo-motor stimulus relative to the user so to present the mechanically displaceable oculomotor stimulus to the user in accordance with the oculomotor assessment, and an eye tracking system configured to monitor an oculomotor response of the user to the mechanically displaceable oculomotor stimulus. The device further comprises a digital data processor in communication with the eye tracking system and operable to execute digital instructions for recording the oculomotor response to the mechanically displaceable stimulus presented in accordance with the oculomotor assessment.