Watery eyes. Advise why does it happen?

Hello. I think you have allergic conjunctivitis. 1. Eye allergies, called allergic conjunctivitis, are a common condition that occurs when the eyes react to something that irritates them (called an allergen). 2. The eyes produce a substance called histamine to fight off the allergen. As a result, the eyelids and conjunctiva (the thin, filmy membrane that covers the inside of your eyelids) become red, swollen and itchy, with tearing and burning. The key to treating eye allergies is a. Avoid or limit contact with the substance causing the problem. B. Avoid rubbing eyes instead do cold compresses. C. Use antiallergic eyedrop like olopat eyedrop twice daily d. Lubricating eyedrop like flogel thrice daily e. Use mild steroid like flurisone in pulse dose in severe allergy this will help you I am very sorry dear to say that there is no medicine that can cure allergy. Only way is to stay away from all those things that you are allergic to. This is a provisional diagnosis. consult your ophthalmologist for detailed examination

It may happen because of rubbing eyes with dirty hands leading to mild infection resulting into  discharge & sticking of eyes, usually bacterial infection, you may put antibiotic eye drops (vigamox eye drops) 3-4 times a day for 3-4 days ,if not getting relief consult local experienced ophthmologist