Left sympathetic innervation to the eye.This is Horner's syndrome (miosis, ptosis, and enophthalmos), caused by defective ipsilateral sympathetic innervation to the affected eye.Loss of parasympathetic innervation (via the oculomotor nerve) to the eye would cause a dilated pupil.Trigeminal damage would result in decreased sensation to the eye.Refs: de Lahunta and Glass, Veterinary Neuroanatomy and Clinical Neurology, 3rd ed. pp. 174-5 and  Cohn and Cote, Clinical Vet Advisor – Dogs and Cats, 4th ed. pp. 481.e3-481.e3, 1232. Image courtesy Caroldermoid.