Consider the following example to get a feeling for the latency problem. Let be the density of the display in pixels per degree. Let
be the angular velocity of the head in degrees per second. Let
be the latency in seconds. Due to latency
and angular velocity
, the image is shifted by
pixels. For example, if
pixels per degree,
degrees per second, and
seconds, then the image is incorrectly displaced by
pixels. An extremely fast head turn might be at
degrees per second, which would result in a
-pixel error.