The iris adjusts the amount of light that enters the eye and helps to increase the depth of focus.
(The iris; adjusts; the amount of light that enters the eye and helps to increase the depth of focus) (the amount of light; enters; the eye) (the amount of light; helps; to increase the depth of focus) Context(the amount of light helps,List([17, 66))):(the amount of light; helps to increase; the depth of focus)
the amount of light helps,List([17, 66))
The iris the amount of light the amount of light the amount of light
adjusts enters helps helps to increase
the amount of light that enters the eye and helps to increase the depth of focus
the eye
to increase the depth of focus
the depth of focus