The common causes of clear blisters after rubbing itchy eyes are allergic conjunctivitis, bacterial conjunctivitis and viral conjunctivitis. 1. Allergic conjunctivitis: when the conjunctiva comes into contact with allergens such as pollen, willow flakes and animal dander, an allergic reaction will occur, which will produce an itchy sensation under the stimulation of histamine and other immune factors, and after rubbing the eyes, it may cause the tissue cells to rupture, so that the tissue fluid will penetrate into the tissue space, which will lead to clear blisters. 2. Bacterial conjunctivitis: If the conjunctiva is infected by bacteria, causing local inflammatory reaction, the conjunctiva in the infiltration of inflammatory cells, there may be itchy eyes, rubbing after the phenomenon of transparent blisters. 3. Viral conjunctivitis: such as enterovirus, adenovirus and other viral infections of the conjunctiva, causing conjunctivitis, the conjunctiva will be itchy, hand rubbing after the conjunctiva and cause irritation, may lead to long transparent blisters. If there are transparent blisters after rubbing the itchy eyes, you must go to the regular hospital to find out the cause of the disease, and actively cooperate with the professional doctor’s treatment.