?
The
____________________
is
at
the
____________________
of
the
eyeball
.
____________________
enters
the
eye
through
the
____________________
,
a
small
hole
in
the
____________________
of
the
iris
.
The
pupil
____________________
and
____________________
depending
on
the
____________________
of
light
it
receives
.
lensshapefocusiris
?
Behind
the
____________________
,
there
is
a
flexible
____________________
.
The
lens
changes
____________________
to
____________________
the
image
.
opticsignalsstimulusbrainretinareceptoreyeball
?
The
____________________
,
at
the
back
of
the
____________________
,
contains
the
____________________
cells
.
They
capture
the
____________________
and
send
____________________
along
the
____________________
nerve
to
the
____________________
.
