There are many types of brain tumors that can cause vision loss, including meningiomas, nerve sheath tumors, craniopharyngiomas, chordomas, pituitary tumors, gliomas, etc., which may appear, and it is clear that the growth is mainly in the range of optic bundles, which compresses the optic nerves and destroys the optic bundles, and all of them may cause vision loss. Meningiomas and gliomas growing in the occipital lobe, etc., with loss of vision on one side of one eye are the most common, and will be accompanied by visual field defects, and those growing in the midline such as pituitary, craniopharyngioma and chordoma. When the tumor grows to a certain size, it will compress the visual crossover, and then there will be bilateral temporal visual field defects, vision loss, blurred vision, according to the judgment of the condition at that time, and improve the examination, according to the different positions and forms of the tumor growth, in order to have a general judgment.