In winters my eyes remain teary most of the times. cause and prevention?

Dry eye: Adequate tears are necessary to lubricate the top layer of the cornea, the clear dome in the front of the eye and the conjunctiva, the "skin" over your eye ball. When they are insufficient, small defects can occur in the top layer, exposung nerves underneath- and this causes discomfort, sandy or gritty feeling and pain. In winter, less humidity and indoor heating dries out tears-lubricate them.

Likely irritation.: Eyes water when tears are too many (due to irritation - allergy, pain, dryness), or drain too slowly. Without speaking ; examining you, i can't offer a specific diagnosis. Keeping eyes protected from winter wind, optimizing allergy meds, ; using artificial tears are all options depending on the cause. Whenever a problem persists, it's best to be examined by a doc to rule out anything more serious.

Dry eyes: Most likely a response (reflex) due to the cold air and / or dry air that comes from house or car heaters. Could be getting some nasal congestion causing the tear drainage system to not work as well and resulting in tearing. If concerned you should see ophthalmologist.