A layer of fog in the eyes after swimming may be caused by water in the eyes or infection, and can be treated with general treatment and medication. 1. Water in the eyes: After swimming, the water in the eyes may accidentally enter into the swimming pool, which may easily cause irritation to the eyes and lead to the above symptoms. Usually, no special treatment is needed, and the eyes can return to the normal state after a period of time. 2. Infection: A layer of fog in the eyes after swimming may also be caused by bacterial infection induced inflammation. The patient should according to their own situation in the doctor’s guidance to choose erythromycin tobramycin and other drugs to help kill pathogens, reduce the irritation of the eyes. Patients who feel a layer of fog in their eyes after swimming should go to the hospital and choose the appropriate method to treat the disease.