Principles of nystagmus treatment 1. Etiological treatment: symptomatic treatment. Nystagmus is mostly a congenital developmental problem with complex causes, which cannot be solved by general surgery. 2.Improvement of visual acuity: for oculogenic nystagmus, the focus is on improving visual acuity, and appropriate trigeminal lenses can be formulated to eliminate compensatory head position and improve visual acuity. 3.Surgical treatment: Idiopathic nystagmus can be operated, and its purpose is to correct its compensatory head position according to the “intermediate band” eye position, transform the eye position, reduce nystagmus, and improve visual acuity. As the extraocular muscles of the slow-phase side are strong, the extraocular muscles of the fast-phase side are weak. For this reason, the two extraocular muscles on the slow-phase side can be backed off to reduce their tension and balance with the extraocular muscles on the fast-phase side. The “middle band” eye position is shifted from the eccentric gaze position to the forward gaze position. If the left side is in the middle band resting nystagmus, the external rectus muscle of the left eye and the internal rectus muscle of the right eye can be moved back 6 mm, the internal rectus muscle of the left eye shortened 6 mm, and the external rectus muscle of the right eye shortened 7 mm (generally the external rectus muscle is moved back 2 mm more than the internal rectus muscle), so that the resting eye position can be shifted to the front. 4.Trigonometry treatment: By wearing trigonometry, the “middle band” of nystagmus is shifted to the anterior position. Improve the situation of oculocerebral tilt. In other words, the head position is improved by compensating for the relationship between the torsional angle of the head position and the optical correction of the trigeminal lens.