Questions about the eyes or vision changes are best addressed by an ophthalmologist.
Tears are an important part of the eye's natural physiology. They help keep the surface of the eye lubricated and make sure that irritants are continually flushed out of the eye. Excessive watering of the eyes can be caused by many things, including allergies; environmental irritants like smoke or chemical fumes; infections of the eye or eyelashes; blockage of the tear duct that drains tears out of the eye; a foreign body trapped in the eye; or a scratch or abrasion of part of the eye surface. Ironically, even dry eyes themselves can also cause excessively watery eyes, as the body's natural response to overly dry eyes is the stimulation of tears.
Many of these conditions will often be associated with other symptoms which can help an evaluating physician identify what is causing the excessive tearing. An thorough eye exam may also be needed to check for foreign bodies, scratches, a blocked tear duct, dry eyes, or other changes with the eye itself. Treating watery eyes depends on the cause. Blocked tear ducts can be opened; eye infections and environmental allergies can be treated with medications; foreign bodies can be removed; and dry eyes can be treated with artificial tears.
The most important thing to remember when it comes to eye health is that anything that causes changes in vision should be evaluated by an eye doctor
who can make sure that there is nothing going on which could permanently jeopardize normal vision.