The cause of blurred vision may be the symptom of excessive fatigue and physical weakness, and it does not exclude the pathological conditions such as brain tumor compression. First of all, most of the cases of weak legs, sleepy and blurred vision occur in the state of over-fatigue after a long time of study or work without sufficient sleep and rest, at this time, it is necessary to timely and effectively rest and sleep to restore physical strength; or in the case of advanced malignant tumors and other malignant diseases leading to the state of weakness, it is necessary to timely consult a doctor to find out the cause of the disease and then treat the symptomatic condition. In addition to the above, sudden weakness and drowsiness of limbs and blurred vision can also occur in the case of brain tumor compression or cerebral hemorrhage, which need to be diagnosed by CT, MRI and other auxiliary examinations. It is recommended to consult a doctor in time to identify the cause of the disease and take corresponding measures.