Among the patients I treat, I often find that some patients have been seeing ophthalmologists for unexplained vision loss until they go blind and then visit the neurosurgery department, where intracranial tumors are diagnosed by cranial CT or MRI. In the last two months, I met several patients who had been seeing ophthalmologists in the early stage due to vision loss caused by intracranial tumor, and they were already blind when they came to our department. The doctor’s sense of responsibility makes me take the time to introduce you to the medical knowledge in this area. There is a medical basis for the saying “the eye is the window to the soul”. The optic nerve is directly connected to the eye and the brain, and many intracranial disorders can cause vision loss, which can be detected early by examining the fundus of the eye. For example, most of the tumors in and around the saddle area cause vision loss or visual field loss at an early stage, and other huge tumors, hydrocephalus or lesions causing intracranial hypertension can also cause vision loss or diplopia, and if these intracranial disorders are not treated in time, they can eventually lead to optic nerve atrophy and cause blindness in patients. Most of the tumors that cause optic nerve damage are benign and slow-growing, and a significant portion of them will be cured after surgical removal. However, if the surgical treatment is late, the chance to save the optic nerve and vision may be lost, which will bring lifelong disability to the patients and seriously affect their quality of life. In the past 30 years, China’s medical career has developed significantly, and a CT scan of the head costs only 2,300 yuan, and an MRI is only about 1,000 yuan, especially CT has already been popularized in county hospitals across the country. Although people have now started to pay attention to health care, compared with developed countries, many people’s medical science knowledge is still very poor, which has been a piece of my heart. Many patients and their families are reluctant to go to the hospital for checkups, perhaps feeling that it is not worth spending such money, but they listen to all kinds of prescriptions and imaginary “panacea”, not knowing that in the end, the loss may be more serious. Finally, I would like to state that the above is not meant to blame some doctors or patients, but to remind everyone: if you find unexplained vision loss, and the ophthalmology department cannot find the cause, you should go to the neurosurgery department as soon as possible and perform a cranial CT or MR examination to exclude intracranial lesions.