As far as I know there are only 3: The 1st keeps the eye moist, the 2nd is to clean the eye from various irratating objects, and the 3rd is the one that depends on feelings, which is used to communicate with our fellow citizens.
The ISBN of End in Tears is 0-09-179641-5.
The three kinds of tears are basal tears, reflex tears, and emotional tears. Basal tears are continually produced to lubricate and protect the eyes. Reflex tears are triggered by irritants, such as smoke or onions, to flush out harmful substances. Emotional tears are released in response to strong feelings, such as sadness or joy, and may contain different chemical compositions compared to the other types.
6.
Lacrimation or lachrymation (lacrima = tear) is the production or shedding of tears. Tears are secretions that clean and lubricate the eyes. There are 3 types of tears: Basal tears lubricate the eye and keep it clear of dust. Reflex tears result from irritation or the eye by foreign particles or vapors. Psychic tears are produced by some type of strong emotional stress.
Pushed - 2009 Trail of Tears 1-5 was released on: USA: 17 March 2009
Valerie - 1986 The Tracks of My Tears 5-4 was released on: USA: 9 October 1989
Gab's Blabs - 2007 There Will Be Tears 1-5 was released on: USA: 12 January 2008
Babylon 5 - 1994 Ship of Tears 3-14 is rated/received certificates of: Australia:PG
Deadliest Catch - 2005 Bitter Tears 5-14 is rated/received certificates of: Australia:PG
Babylon 5 - 1994 Ship of Tears 3-14 was released on: USA: 29 April 1996
Double Dragon - 1993 River of Tears 1-5 was released on: USA: 10 October 1993
Tears on a Letter - 2008 was released on: USA: 5 June 2008 (Hollywood Black Film Festival)