Paralytic strabismus covers a wide range of congenital and acquired strabismus. Paralytic strabismus caused by congenital factors and often accompanied by abnormal head position, which occurs in early birth, is more harmful to children, if not corrected early, it not only affects the aesthetics, but also affects the physical development of children, and easily leads to monocular amblyopia and bilateral monocular function dysplasia, affecting the establishment of stereo vision, and has an impact on school and adult career choice, life, and family organization. Therefore, early detection and early treatment are necessary. Common causes include: 1. trauma. 2. 2. Inflammation or poisoning leading to peripheral neuritis, cerebral and meningitis, rhinitis, orbital cellulitis, etc. 3, Cerebrovascular disease. 4, Intraorbital, optic nerve or intracranial tumors. 5, Systemic diseases. The main manifestations of paralytic strabismus are: 1. Eye position deviation when gazing in front or in a specific direction. 2, limited eye movement, depending on the degree of paralysis, the performance of monocular or bilateral eyes to a certain direction of rotation ability is reduced or can not. 3, compensatory head position: in order to avoid double vision interference when gazing in the direction of the paralyzed muscle movement, often take a continuous head tilt, head turn and other poor posture. 4, double vision is one of the main symptoms of acquired paralytic strabismus, in mild cases only blurred vision, in severe cases even vertigo, nausea, vomiting, can take compensatory head position of diplopia can be reduced or eliminated. Treatment of paralytic strabismus: 1. Patients who can maintain orthoptic vision in normal head position or mild compensatory head position do not need surgical treatment. 2. Some patients with mild strabismus can also obtain binocular monovision by wearing trigeminal lenses. 3.Patients with obvious strabismus, who cannot take compensated head position gaze, or whose compensated head position is obvious, can only correct strabismus or improve head position through surgery. 4.Acquired ophthalmoplegia should be treated for the cause first, and if the condition is stable for about six months, surgery can be considered if the strabismus cannot be eliminated. Early surgery is recommended for congenital palsy. 5, the condition is not stable, and diplopia obviously affects normal life, can use monocular masking or wearing trigeminal lens method to overcome diplopia interference.