Three HMD's were used during the course of the dissertation experiments. The below specification are taken from . Specifications sometimes vary slightly depending on the source.
For the reported presence experiments described in Chapter 5, the Division dVisor was used. The dVisor features 294x141 pixels, horizontal FOV 105, vertical FOV 41, and 46stereo overlap. It weighs 8.8 pounds.
The presence measure experiments described in Chapter 4 used the Virtual Research VR4 HMD. The VR4 has the advantages over the dVisor of higher resolution; of being much less heavy and bulky; and of being light-tight. Unfortunately, the VR4 has a lower FOV than the dVisor. The VR4 features 247x230 pixels, horizontal FOV 48, vertical FOV 36, and 100% stereo overlap. It weighs 33 ounces.
The experiments reported in Chapter 6 made use of the Virtual i-O i-glasses! VTV/VPC. This HMD features 263x230 color pixels and a 30 horizontal by 24 vertical FOV with 100% overlap between the two eyes. It weighs 8 ounces. The image is displayed on a semi-transparent half-silvered mirror. The half-silvered mirror has the crucial advantage (for the experiments reported in Chapter 6) of allowing both a see-through and occluded mode. In the see-through mode, the image on the half-silvered mirror is overlaid on the external environment. By mounting an occlusion behind the mirror, the HMD can also be used in a mode in which only the display itself is visible.