1, eye position oblique eye movement disorder When an extraocular muscle is paralyzed, the relative strength of its antagonist muscle is too strong, and the eye is oblique in the direction opposite to the action of the paralyzed muscle. Restricted rotation in the direction of the action of the paralyzed muscle. If the external rectus muscle is paralyzed, the eye is restricted to turn outward and is internally oblique; if the internal rectus muscle is paralyzed, the eye is restricted to turn inward and is externally oblique. 2. diplopia Diplopia due to disruption of fusion function, seeing one object as two objects, orientation and localization disorders, dizziness and nausea, unstable gait, symptoms are significantly reduced or disappear when one eye is masked. 3, compensatory head position In order to overcome the interference of diplopia, the patient automatically tilts the head to the side where the paralyzed muscle acts, and at the same time can also turn the face to overcome the diplopia caused by internal and external rectus muscle paralysis; or lift the chin up or inward, plus lightly turn the face to overcome the diplopia caused by upper and lower rectus muscle paralysis; or tilt the head to the shoulder and turn the chin and face to overcome the diplopia caused by upper and lower oblique muscle paralysis. The aim is to obtain binocular monocularity and avoid diplopia with a series of features that are expressed.