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Induced nystagmus
An easy way of inducing nystagmus is by having the person close her or his eyes
and spin around. After a few spins, there is a distinct jerking of the eyes from
side to side when they are reopened: this is rotatory-induced nystagmus. The
degree of nystagmus varies greatly between people and even in the same person at
different times.
Another type of induced nystagmus is the optokinetic nystagmus (OKN). It can be
elicited by presenting a moving pattern. The eyes tend to track the pattern, but
snap back regularly. The nystagmus persists for a short while even after the
cessation of the stimulus. This is called "opto-kinetic after-nystagmus" (OKAN).
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