The common causes of watery eyes are over-production of tears and blocked tear ducts. Watery eyes is a condition that leads to an overflow of tears on the face and is more prevalent in children under 1 year and adults over 60.
Infants born with underdeveloped tear ducts have watery eyes, but the problem disappears within a few weeks as the ducts develop. Narrowed or blocked tear ducts prevent tears from draining away. The trapped tears accumulate in the tear sac and increase the risk of infection. The trapped tears then fall excessively.
Inflammation is the leading cause of narrowed tear ducts. Irritants such as fumes, onions, allergic and infective conjunctivitis, eye injury and ectropion can cause excessive tear production.