<prompt> Enophthalmus is due to palsy ofLevator palpebrae superiorisSuperior tarsal muscleOrbital muscleInferior tarsal muscle  <response>: Ref: BD Chaurasias HUMAN ANATOMY, Volume 3, 4th edition. Enophthalmos i.e. retraction of the eyeball; is possibly caused by paralysis of the smooth orbitalis muscle in the floor of the orbit. 