Optic nerve compression is a common symptom of craniopharyngioma, which is characterized by changes in visual acuity, visual field and fundus changes. The suprasellar tumor has no certain growth direction, resulting in different compression sites, so that the visual field defect varies greatly, which can be quadrantal defect, hemianopia, dark spot, etc. The following two conditions are introduced for patients: 1. Tumor compression of the optic cross can cause visual field defect, common for two temporal side hemianopia, such as double temporal side lower quadrant hemianopia, suggesting that the compression is from top to bottom, and the degree of damage on both sides may not be consistent. If the tumor compresses only one side of the optic tract, it will produce isotropic hemianopia. If the tumor severely compresses the optic cross, it may cause primary optic nerve atrophy; if the tumor invades the third ventricle and causes hydrocephalus and increased intracranial pressure, it may produce secondary optic nerve atrophy. Oculomotor nerve may be involved, resulting in diplopia and other symptoms. 2. Intersaddle type tumor compresses the optic cross from below to upward, producing visual field defect same as pituitary tumor, and vision loss is related to optic nerve atrophy. Sometimes it can cause sudden blindness due to bleeding infarction at the optic cross and blood circulation obstruction. In patients with primary optic nerve atrophy, optic disc edema rarely occurs again. Foster-Kennedy syndrome can occur when the tumor grows to one side. In children, early visual field defects are not noticed until the visual acuity is severely impaired. Tips: When craniopharyngioma compresses the optic nerve and causes vision problems, you should go to the relevant specialized hospital for consultation and treatment as soon as possible to avoid serious consequences of delay.