Patients with advanced lung adenocarcinoma have the possibility of blindness. Advanced stage of lung adenocarcinoma can lead to spreading and metastasis of cancer cells, if cancer cells metastasize to brain, intracranial tumor compressing optic nerve can affect vision or even lead to blindness. Patients with vision loss or blindness need to have brain CT examination and ophthalmologic examination, including fundoscopy, to make a clear diagnosis. At this time, medication can be adopted, such as using drugs to reduce intracranial pressure, and radiotherapy and other methods to shrink the tumor to relieve symptoms. Patients with advanced stage of lung adenocarcinoma should not eat spicy and greasy food, have a light diet, actively consult the doctor and standardize the treatment.