## Overview Strabismus is abnormal eye position. Damage to the oculomotor nerve (cranial nerve III) causes the eye to deviate downward and outward because the muscles that elevate and adduct the eye are paralyzed. Associated signs include a dilated pupil and drooping upper eyelid. Causes include equine protozoal myeloencephalitis, head trauma, or brain abscess. ## Causes Oculomotor nerve dysfunction from neurologic disease or trauma. ## Diagnosis Neurologic examination of eye position and pupil. ## Treatment Directed at the underlying neurologic disease. ## Recovery and Prognosis Depends on the cause. Some traumatic cases improve. Protozoal disease requires specific treatment. ## Prevention Depends on etiology.
eye deviated downward and outward; dilated pupil; drooping upper eyelid; may indicate equine protozoal myeloencephalitis, trauma, or abscess
## Overview Strabismus is abnormal eye position. Damage to the oculomotor nerve (cranial nerve III) causes the eye to deviate downward and outward because the muscles that elevate and adduct the eye are paralyzed. Associated signs include a dilated pupil and drooping upper eyelid. Causes include equine protozoal myeloencephalitis, head trauma, or brain abscess. ## Causes Oculomotor nerve dysfunction from neurologic disease or trauma. ## Diagnosis Neurologic examination of eye position and pupil. ## Treatment Directed at the underlying neurologic disease. ## Recovery and Prognosis Depends on the cause. Some traumatic cases improve. Protozoal disease requires specific treatment. ## Prevention Depends on etiology.
eye deviated downward and outward; dilated pupil; drooping upper eyelid; may indicate equine protozoal myeloencephalitis, trauma, or abscess