Your eye's iris is just like the iris in a camera - it controls the amount of light entering the eye.
(the amount of light; entering; the eye) (it; controls; the amount of light entering the eye) Context(it controls,List([52, 63))):(Your eye's iris; is; just like the iris in a camera)
it controls,List([52, 63))
the amount of light it Your eye's iris
entering controls is
the eye
the amount of light entering the eye
just like the iris in a camera