Eye motion-controlled mouse
When the eyes move, biopotentials
are generated. These corneo-
retinal potentials (from the back of
the eye to the front of the eye)
biopotentials are generated by the
retinal dipole, and variously called
the EOG (Electro-oculogram),
ERG (Retinogram) or ENG
(Nystagmogram). The potentials
vary with a number of factors, e.g.
light level, blinking, and tends to
drift