<s>
The	O
health	B-Algorithm
effects	I-Algorithm
of	I-Algorithm
3D	I-Algorithm
are	O
the	O
aspects	O
in	O
which	O
the	O
human	O
body	O
is	O
altered	O
after	O
the	O
exposure	O
of	O
three-dimensional	O
(	O
3D	O
)	O
graphics	O
.	O
</s>
<s>
These	O
health	O
effects	O
typically	O
only	O
occur	O
when	O
viewing	O
stereoscopic	B-Algorithm
,	O
autostereoscopic	B-Algorithm
,	O
and	O
multiscopic	B-General_Concept
displays	O
.	O
</s>
<s>
Newer	O
types	O
of	O
3D	O
displays	O
like	O
light	B-Algorithm
field	I-Algorithm
or	O
holographic	B-Algorithm
displays	I-Algorithm
do	O
not	O
cause	O
the	O
same	O
health	O
effects	O
.	O
</s>
<s>
The	O
viewing	O
of	O
3D	O
stereoscopic	B-Algorithm
stimuli	O
can	O
cause	O
symptoms	O
related	O
to	O
vision	O
disorders	O
that	O
the	O
individual	O
already	O
had	O
,	O
as	O
a	O
person	O
with	O
a	O
healthy	O
binocular	B-Algorithm
vision	I-Algorithm
should	O
n't	O
experience	O
any	O
side	O
effects	O
under	O
three-dimensional	O
exposure	O
.	O
</s>
<s>
An	O
increase	O
in	O
vergence-accommodation	O
conflict	O
occurs	O
as	O
the	O
eye	O
changes	O
its	O
movement	O
patterns	O
to	O
focus	O
on	O
the	O
position	O
of	O
objects	O
recreated	O
by	O
stereoscopy	B-Algorithm
.	O
</s>
<s>
One	O
may	O
counter	O
vergence-accommodation	O
conflict	O
when	O
seeing	O
a	O
3D	B-Algorithm
movie	I-Algorithm
or	O
using	O
a	O
near-eye	O
display	O
system	O
(	O
e.g.	O
,	O
augmented	B-General_Concept
reality	I-General_Concept
(	O
AR	O
)	O
and	O
virtual	B-Application
reality	I-Application
(	O
VR	O
)	O
)	O
adapting	O
stereoscopic	B-Algorithm
stimuli	O
without	O
registration	O
function	O
.	O
</s>
<s>
This	O
is	O
due	O
to	O
the	O
test	O
's	O
requirement	O
for	O
the	O
eyes	O
to	O
work	O
coordinated	O
with	O
the	O
brain	O
in	O
order	O
to	O
render	O
a	O
3D	B-Algorithm
image	I-Algorithm
.	O
</s>
<s>
According	O
to	O
the	O
American	O
Optometric	O
Association	O
there	O
are	O
approximately	O
from	O
3	O
to	O
9	O
million	O
people	O
with	O
binocular	B-Algorithm
vision	I-Algorithm
problems	O
.	O
</s>
<s>
If	O
an	O
individual	O
lacks	O
binocular	B-Algorithm
vision	I-Algorithm
,	O
then	O
a	O
3D	O
perspective	O
is	O
impossible	O
and	O
simply	O
unachievable	O
.	O
</s>
<s>
Watching	O
shows	O
and/or	O
movies	O
in	O
3D	O
can	O
help	O
to	O
point	O
out	O
those	O
problems	O
earlier	O
,	O
working	O
as	O
a	O
screening	O
check	O
and	O
noticing	O
the	O
lack	O
of	O
binocular	B-Algorithm
vision	I-Algorithm
so	O
that	O
a	O
proper	O
treatment	O
can	O
be	O
applied	O
.	O
</s>
<s>
These	O
problems	O
may	O
also	O
reflect	O
upon	O
a	O
fundamental	O
vision-related	O
problem	O
not	O
entirely	O
linked	O
to	O
binocular	B-Algorithm
vision	I-Algorithm
issues	O
.	O
</s>
<s>
Strabismus	O
is	O
the	O
lack	O
of	O
binocular	B-Algorithm
vision	I-Algorithm
.	O
</s>
<s>
Eyes	O
are	O
n't	O
properly	O
aligned	O
and	O
so	O
the	O
input	O
the	O
brain	O
has	O
to	O
render	O
is	O
in	O
mismatch	O
,	O
preventing	O
correct	O
3D	O
stereoscopic	B-Algorithm
perception	O
from	O
happening	O
.	O
</s>
<s>
Seeing	O
3D	B-Algorithm
movies	I-Algorithm
can	O
increase	O
rating	O
of	O
symptoms	O
of	O
nausea	O
,	O
oculomotor	O
and	O
disorientation	O
,	O
especially	O
in	O
women	O
with	O
susceptible	O
visual-vestibular	O
system	O
.	O
</s>
<s>
Headaches	O
,	O
eyestrain	O
,	O
dizziness	O
,	O
or	O
nausea	O
after	O
watching	O
3D	B-Algorithm
films	I-Algorithm
are	O
experienced	O
.	O
</s>
<s>
Basic	O
binocularity	B-Algorithm
is	O
already	O
developed	O
when	O
the	O
child	O
is	O
from	O
6	O
to	O
12	O
months	O
old	O
.	O
</s>
