Abstract
We designed a head mounted display (HMD) that is suited for underwater use. To reduce the buoyancy, we developed an internal optical design in which the viewing angle of the HMD remains wide even when the device is filled with water. Two types of HMD were prepared and tried in subject experiments. The first is an off-the-shelf HMD that was water-tightened with adhesive and vinyl tape. The second is a rectangular parallelepiped type HMD with a structure that can be filled with water. Subjects evaluated these HMDs in terms of clearness, wideness of view, ease of swimming, and feeling of immersion while watching 360\(^\circ \) video in underwater. Until now, there had been no discussions regarding the optics of HMDs used in water. This research has established a method for the optical design of an HMD that can be used underwater and was first evaluated by subjects.
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