The VR Book: Human-Centered Design for Virtual Reality by Jason Jerald

Author:Jason Jerald [Jerald, Jason]
Language: eng
Format: azw3, pdf
Publisher: Association for Computing Machinery and Morgan & Claypool Publishers
Published: 2016-08-05T04:00:00+00:00

26.3.6 The Eye Reference Frames

The eye reference frames are defined by the position and orientation of the eyeballs. Very few VR systems support the orientation portion of eye reference frames due to the requirement for eye tracking (Section 27.3.2). However, the left/right horizontal offset of the eyes is easily determined by the interpupillary distance of the specific user measured in advance of usage.

When looking at close objects (for example, when sighting down the barrel of a gun) and assuming a binocular display, eye reference frames are important to consider because they are differentiated from the head reference frame due to the offset from the forehead to the eye. The offset between the left and right eyes results in double images for close objects when looking at an object further in the distance (or double images of the further object when looking at the close object). Thus, when users are attempting to line up close objects with further objects (e.g., a targeting task), users should be advised to close the non-dominant eye and to sight with the dominant eye (Sections 9.1.1 and 23.2.2).

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