- Kaiser SR80 ProView
For the display device we currently have five types of head-mounted displays (HMDs) which offer us different levels of visual resolution, weights and field-of-view.
First, we have four light-weight eMagin Z800 3DVisorHMDs which offer a geometric field of view of approximately 32x24 degrees at a resolution of 800x600 pixels per eye. They each weigh 0.25kg and are specifically useful for multi-user experiments where it is desirable to control the visual input for multiple participants. Second, we have the nVisor SX60 HMD which has a field of view of approximately 44x35 degrees with a resolution of 1280x1024 per eye and weighs approximately 1.7kg. This HMD has greater resolution but weighs more and therefore the experimenter usually wears the backpack which holds the graphics/laptop for the HMD. Similarly, the nVisor SX111 HMD provides an even larger field of view of approximately 102x64 degrees with a resolution of 1280x1024 per eye. But this HMD also weights about 2kg and we only use this HMD for very short experiments (less than 30 minutes) and ideally for experiments that do not involve a lot of movement on the part of the participant. Finally, we have a Kaiser SR80 ProView HMD which has a field of view of 63x53 degrees with a resolution of 1280x1024 and weighs 0.79g. This HMD has high quality visual resolution and field of view and is quite light-weight; however it does not have battery power and so is not currently used for mobile experiments. Instead we currently use the Kaiser HMD for experiments where the participant is always in the same location (e.g. seated or walking on a treadmill). For the former HMDs (eMagin and nVisor, all further technical components (i.e. laptop, video signal splitter controller, power supply) are mounted on a backpack. When using an HMD within a limited area, for example, on the omnidirectional treadmill, the HMDs can be connected from the ceiling thus allowing to connect to a computer with better graphics capabilities in the control room.We also have the xSight 6123 that presents an image of 1920 × 1200 pixels in front of each eye across a FoV of 118? horizontally and 45? in total while the weight does not exceed 400 g [Sensics Inc., 2010]. We have used this HMD with the MPI CyberMotion Simulator.