<prompt> Action of ciliary muscle:Constriction of pupilDilatation of pupilChange in shape of lensAll of the above  <response>: Ciliary muscleIt is a ring of striated smooth muscle in the eyes middle layer vascular layerIt controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humour into Schlemms canal.It changes the shape of the lens within the eye, not the size of the pupil which is carried out by the sphincter pupillae muscle.The muscle has only parasympathetic innervation. 