Why do our eyes produce tears?

I just don't see why god (or, to atheists,evolution) would make our eyes water if something essential happens.I really just don't see any advantage within having teary eyes...
Answers:
The mechanical process of tearing is present contained by most land mammals, and is an adaptation that prevents the eye from drying out and also allows the eye to reflexively remove irritants, thus protecting the sensitive tissues of the eye.

Emotional tears are only present surrounded by humans, and may be beneficial to pre-verbal children as a way to indicate the presence of a negative stimulus in charge to receive parental intervention. For older individuals, tears can act to enhance interpersonal relationships by displaying emotions. Source(s): http://en.wikipedia.org/wiki/Tears#Types
Tears maintain our eyes from drying out, and they also help to keep our eyes clean of sundry bits of gunk.

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