In our daily life, we often encounter patients who say, “Ahhh, why can’t I see anything lately?” Then they go to the ophthalmology department and check and check without finding anything wrong with their eyes. In fact, the eyes are the windows of people, the eyes are in the front of the human cranial brain, a sharp decline in vision, in addition to a small part of the consideration of the eye itself, more alert to intracranial lesions, because the visual pathway in addition to a small section in the orbit, most of the intracranial, any section of the lesion may cause a sharp decline in vision, the following to introduce what intracranial lesions can cause a sharp decline in vision: 1, the saddle area tumors, including pituitary tumors, the skull base meningioma, cranial tumors, cranial tumors, cranial tumors, cranial tumors, cranial tumors. These tumors do not affect vision in the early stage, but can affect the eyesight. These tumors do not affect vision in the early stage, but once they compress the optic nerve, vision will drop sharply, or the tumor bleeds and then expands sharply to compress the optic nerve and cause vision to drop sharply. 2.Temporo-occipital glioma or meningioma will not affect vision in the early stage, but once it compresses the visual pathway, it may cause a sharp loss of vision, and when the intracranial pressure is high, there may be headache, nausea and vomiting, convulsions and other symptoms. 3.Vascular malformation in the temporo-occipital area Due to long-term blood theft of malformed vessels, causing ischemia in the temporo-occipital lobe, or after the bleeding of malformed vascular mass compressing the visual pathway, it can cause vision loss. 4.Intracranial aneurysm Posterior communicating aneurysm can cause visual impairment, eye movement disorder, upper eyelid ptosis due to compression of the arteriolar nerve when it expands rapidly, and headache, nausea and vomiting can occur after a small amount of bleeding, and coma and other symptoms can occur when the amount of bleeding is larger. 5. Hydrocephalus Chronic hydrocephalus can also cause progressive vision loss, which is slow and not easily detectable. In summary, the rapid decline in vision should be taken seriously, in addition to eye examinations, do not forget to check the neurosurgery department to exclude intracranial lesions. If the cause is found in time and removed through modern medical technology, good treatment results can be expected.