Brain tumors can manifest in various forms, the most common one being headache. However, did you know that vision loss is also a common clinical manifestation of brain tumor? The most common cause is intracranial tumor in the saddle area, which directly compresses the optic nerve or the optic cross-visual tract, causing vision loss and visual field loss. Tumors in other non-saddle areas of the brain may also cause vision loss, which is due to chronic intracranial pressure increase and optic papillary edema, and even atrophy of the optic nerve during the growth of the tumor as it gradually increases in size, thus causing vision loss. Ms. Chen, who is 66 years old this year, had a cataract in her right eye 3 years ago because of blurred vision, and her vision was stable for a period of time after eye surgery. However, in the past two months, her vision became blurrier and blurrier, and she found that her optic nerve was atrophied. The ophthalmologist, who was very experienced, suggested that Ms. Chen do an MR of her brain, and this examination revealed that there was a large meningioma in her brain, which compressed the optic nerve and caused Ms. Chen to see more and more blurred in both eyes, which had affected her normal life. After finding the real cause of Ms. Chen’s vision loss, there was a solution. After the meningioma in the saddle area of Ms. Chen’s brain was removed, Ms. Chen obviously felt that she could see things brighter than before. Tumors in the saddle area of the brain are common brain tumors, including many types of tumors, commonly pituitary tumors, meningiomas, craniopharyngiomas, gliomas, etc. These tumors directly compress the optic nerve and cause vision loss. Only when the tumor is removed can the compression on the optic nerve be released and the patient’s vision may be restored. However, the tumors that compress the optic nerve need to be detected and removed in time to achieve better results. If the tumor is not detected in time, the tumor has caused severe atrophy of the optic nerve during the long-term chronic compression process, forming irreversible damage, and the patient has almost no sense of light, even if the tumor is surgically removed, most of the vision will be difficult to improve.