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By definition, VR is a high-end user interface that involves real-time simulations and interactions through multiple sensorial channels (visual, auditory, tactile, smell etc.). VR interface usually involves multiple representations to address the multiple sensorial modalities. Depending on the application, VR interface properties could significantly vary. Aside from generally considered VR visual feedback factors, such as ergonomic factors (e.g., the adaptability of the display to provide immersion in the virtual world) and perception factors (e.g. graphics refresh rate, field of view and depth perception), we have to account for psychological factors, which relate to goal-dependent image understanding: users' understanding of the scene and users' adaptation and training to the virtual environment through efficient learning to compensate for scale and translation errors.
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