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What are the three different types of tears found in our eyes?

Dr. Michael Roizen, MD
Internal Medicine
Not counting the crocodile variety, there are three different kinds of tears: basal, irritant, and emotional.

Basal tears keep our eyes lubricated, which is important in preventing damage by air currents and bits of floating debris.

Irritant tears (or reflex tears) are produced when the eyes are hit by wind or sand (or insects or rocks). Both basal and irritant tears have the same goal: protecting the eyes.

Emotional tears are secreted in moments of intense feeling – sometimes joy, but more often sorrow. They contain stress hormones as a way of getting rid of them. This may be one reason that crying is therapeutic when we're under a lot of stress.
YOU: The Owner's Manual, Updated and Expanded Edition: An Insider's Guide to the Body that Will Make You Healthier and Younger

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