link user performance to critical system parameters. . .fit HMD devices to a diverse range of head shapes and sizes. . .asses the limits of head-supported weight and size. . .present high-quality imagery. . .prevent eye strain and fatigue with well-aligned imagery. . .use the correct model for presenting stereoscopic imagery. . .and more. HMD visual displays, image alignment, head and neck strain and brain-actuated control are explored in depth.

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