Perceptual Thresholds for Radial Optic Flow Distortion in Near-Eye Stereoscopic Displays

Area of Science:

• Human-Computer Interaction
• Perceptual Psychology
• Virtual Reality Display Technology

Background:

• Near-eye Head-Mounted Optics (HMOs) enhance virtual reality (VR) immersion using visual cues.
• Perceptual artifacts, like vergence-accommodation conflict (VAC), can degrade VR user experience.
• Varifocal displays, while mitigating VAC, introduce new artifacts such as radial optic flow.

Purpose of the Study:

• To quantify user sensitivity to radial optic flow artifacts in varifocal displays.
• To investigate the potential of blink suppression for masking these artifacts.
• To provide empirical data for designing future VR display systems.

Main Methods:

• Conducted psychophysical studies to measure perception thresholds for radial optic flow.
• Assessed artifact perception before, during, and after self-initiated blinks.
• Quantified visual sensitivity changes associated with blink timing.

Main Results:

• User sensitivity to radial optic flow was reduced by a factor of 10 during blinks.
• Distortions up to 1.5-2.0% were imperceptible during the ~70 ms blink period.
• Normal viewing sensitivity was ~0.15% image size change.

Conclusions:

• Rapid radial optic flow distortions can be effectively masked by natural blinks.
• Blink suppression offers a viable strategy for mitigating visual artifacts in varifocal VR.
• Findings inform engineering requirements for improved VR hardware and software correction algorithms.