<s>
Video-oculography	B-Algorithm
(	O
VOG	O
)	O
is	O
a	O
non-invasive	O
,	O
video-based	O
method	O
of	O
measuring	O
horizontal	O
,	O
vertical	O
and	O
torsional	O
position	O
components	O
of	O
the	O
movements	O
of	O
both	O
eyes	O
(	O
eye	B-General_Concept
tracking	I-General_Concept
)	O
using	O
a	O
head-mounted	O
mask	O
that	O
is	O
equipped	O
with	O
small	O
cameras	O
.	O
</s>
<s>
The	O
measurement	O
of	O
the	O
horizontal	O
and	O
vertical	O
components	O
is	O
well	O
established	O
technology	O
which	O
uses	O
pupil	O
tracking	B-Operating_System
and/or	O
corneal	O
reflection	O
tracking	B-Operating_System
and	O
has	O
been	O
widely	O
applied	O
,	O
for	O
example	O
for	O
tracking	B-Operating_System
eye	O
movements	O
in	O
reading	O
.	O
</s>
<s>
Approaches	O
to	O
solving	O
this	O
problem	O
include	O
,	O
among	O
others	O
,	O
polar	O
cross	O
correlation	O
methods	O
and	O
iris	O
pattern	O
matching/tracking	O
.	O
</s>
<s>
VOG	O
can	O
be	O
used	O
in	O
eye	O
examinations	O
for	O
quantitative	O
assessments	O
of	O
ocular	O
motility	O
,	O
binocular	B-Algorithm
vision	I-Algorithm
,	O
vergence	B-Algorithm
,	O
cyclovergence	B-Algorithm
,	O
stereoscopy	B-Algorithm
and	O
disorders	O
related	O
to	O
eye	O
positioning	O
such	O
as	O
nystagmus	O
and	O
strabismus	O
.	O
</s>
