Lung cancer is likely to cause blurred vision. The most common symptom in the early stage of lung cancer is cough, which often manifests as irritating paroxysmal dry cough with little or no sputum, and with the progression of the disease, it may manifest as chest pain, hoarseness, hemoptysis, lethargy, bone pain and so on. When tumor tissues metastasize to orbital or post-eye area, it can press and infiltrate local tissues, and then cause blurring of vision; if tumor tissues metastasize to central nervous system, it can press brain tissues and lead to intracranial pressure, which can indirectly press the eyes and cause patients to have blurring of vision. Patients diagnosed with lung cancer with blurred vision are recommended to go to hospitals and ask doctors to make judgments, rather than making judgments blindly on their own.