EOG is a method for sensing eye movement and is based
on recording the standing corneal-retinal potential arising
from hyperpolarizations and depolarizations existing between
the cornea and the retina; this is commonly known as an
electrooculogram [13]. This potential can be considered as
a steady electrical dipole with a negative pole at the fundus
and a positive pole at the cornea [see Fig. 1(a)]. The standing
potential in the eye can thus be estimated by measuring the
voltage induced across a system of electrodes placed around
the eyes as the eyegaze changes, thus obtaining the EOG
(measurement of the electric signal of the ocular dipole).