Tearing of the eye is one of the most prevalent problems observed. Tearing of the eyes has multiple causes associated with it. To enumerate a few common causes:
(1) allergy of the eye. It is usually caused by improper eye hygiene. It occurs with symptoms of pricking, itching, irritation, watering, foreign body sensation and discomfort. There is a tendency to rub the eyes with fingers, handkerchief, cloth, etc. This is not a good habit because it tends to transmit lots of virus, bacteria and dust into the eye. Allergy usually presents with symptoms of watering (clear water), redness and itching of the eye. Thus, eye hygiene remains the principal modality of treatment along with eye drops as a supplement.
(2) infectious conjunctivitis: this is usually associated with white-yellowish discharge. There may occur associated pain and sensation of itching, pricking, watering and discomfort. If so, it would be a good idea to go and show to an eye specialist in person.
(3) foreign body lodged in the eye. This is more commonly associated with people who drive 2 wheeler vehicles without protection. It occurs more commonly in one eye. Foreign bodies that commonly get lodged are eyelashes, insect wings, small insects, dust particles, iron particles (more common with people working in the iron industry) the solution for a foreign body lodged in the eye would be better provided by an eye specialist at the clinic because it would require immediate removal from the eye and appropriate therapy.
(4) raised eye pressure: this is a condition known as glaucoma. It is not so common as the previous mentioned conditions. There is usually associated pain in the eyes. It is commonly bilateral (occurs in both eyes). There is usually a positive family history of glaucoma associated in a majority of the cases.
(5) inflammation of the covering layers of the eyeball. This is known as" uveitis" it is also a relatively less common condition. There is associated pain. It would require a thorough eye checkup including the retina-thus a good idea would be to visit the eye specialist in person.
From the symptoms described by you, it seems more likely to be a case of allergy. Maintaining the precautions and hygiene that I mentioned should probably work well for you. You could also use a lubricant eye drop along with an anti-histamine eye drop. (3-4 times daily)
(6) obstruction of the connecting passage between nose and the eye (nasolacrimal duct). This has shown to cause severe watering and tearing. It requires investigation by the eye specialist in person (sac syringing should be done). Likewise, depending upon the result of this test, the treatment should be planned.
Systane is good but you might first want to get your eyes checked thoroughly by an eye specialist.
Hope my suggestions helped you. Take care,
Shield360 
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