So lacrimation is that you produce tears all the time?

Tears: Yes, lacrimation is just the medical term for making tears.

Yes you are right: Lacrimation is normal continuos secretion of tears by lacrimal glands an excessive amont of tear production as in crying or weeping is also spelled lachrymation.

In a way, yes.: Lacrimation is the production of tears. The lack of adequate production of tears is called xerophthalmia. This can be caused by the deficiency of vitamin a resulting in a dryness of the conjunctiva and cornea. If left untreated, it can lead to corneal ulceration and ultimately blindness. Other causes of dry eye include aging, poor lid closure, scarring from previous injury.Treat artificial tears.

Lacrimation: Tear production from the lacrimal gland due to stimulus initiating a tearing reflex. Basal tears are produced by tear glands in the lids.

Excessive tearing: Lacrimation is an excess tearing. It can be due to excess production which is mainly caused by eye condition and sometime due to an irritation. It can also be due to blockage or tightness of the tear drainage system. A complete evaluation by your ophthalmologist can pinpoint the cause.