<s>
Irissometry	B-Algorithm
describes	O
the	O
method	O
of	O
detection	O
,	O
identification	O
,	O
and	O
tracking	O
of	O
features	O
in	O
the	O
iris	O
and	O
its	O
deformations	O
as	O
a	O
function	O
of	O
changes	O
in	O
pupil	O
size	O
and	O
eye	O
rotation	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
pupil	O
's	O
border	O
may	O
slightly	O
wobble	O
and	O
alter	O
in	O
shape	O
within	O
the	O
iris	O
during	O
changes	O
in	O
pupil	O
size	O
and	O
eye-movements	O
,	O
which	O
can	O
be	O
problematic	O
for	O
eye	B-General_Concept
trackers	I-General_Concept
which	O
base	O
their	O
gaze	O
estimation	O
on	O
the	O
center	O
mass	O
of	O
the	O
pupil	O
border	O
.	O
</s>
<s>
As	O
such	O
,	O
eye-trackers	O
may	O
improve	O
the	O
accuracy	O
of	O
gaze	B-General_Concept
tracking	I-General_Concept
by	O
relying	O
on	O
peripheral	O
iris	O
features	O
rather	O
than	O
the	O
pupillary	O
border	O
.	O
</s>
<s>
An	O
open-source	O
MATLAB-based	O
irissometry	B-Algorithm
code	O
is	O
available	O
on	O
GitHub	B-Application
.	O
</s>
