
54 Virtual Reality: Concepts and Technologies
Figure 3.4 Accommodating infinity and accommodating a short distance (simplified optical diagram)
As in accommodation, the convergence of eyes is done subconsciously, except if
the person wants to squint. The movement of eyes in the orbital globes to change
the convergence point and/or to follow a moving object can be very quick, with a
maximum speed of approximately 600 degrees per second.
Since accommodation and convergence of eyes is related to the depth of the object
being observed, there is a relation between the two. This correspondence is not innate
in humans, but acquired experimentally and subconsciously ...