Hot weather eyes can not open, may be transient cerebral ischemia, visual fatigue, eye infections and other causes. 1. Transient cerebral ischemia: when subjected to microembolism, hemodynamic changes, changes in blood composition, cerebral vascular spasm or pressure, etc., there will be hot weather eyes can not open the situation, the common symptom is weakness, one side of the body numbness, loss of vision and so on. 2. Visual fatigue: hot weather eyes can not open, may be visual fatigue, due to the eyes to see objects feel tired will cause such a phenomenon, generally manifested as eye soreness, dryness, can not open, and even part of the patient will feel dizziness. 3. Eye infection: If the patient suffers from conjunctivitis and other eye inflammation, mainly caused by bacteria, mycoplasma, viruses and other infections, resulting in hot weather eyes can not open, accompanied by redness, swelling, congestion and other symptoms. If the condition lasts for a long time, you can take targeted treatment under the guidance of a doctor, according to the specific performance of the patient’s condition.