There is little secretion from lacrimal gland. On the inner surface of the eyelid, as the saying goes, "People only cry when they are sad." People often burst into tears when they are extremely sad, when they are excited, and when they are happy, they will burst into tears. Many external factors and mental stimuli, such as sandstorms, strong light, pain and foreign body stimulation, will make people cry. Where did you get so many tears? It turns out that the eyes have a "factory" that specializes in making tears-lacrimal gland. There is a lacrimal fossa in the bony fossa of the outer upper corner of the orbit, and the lacrimal gland of the eyelid is located in this fossa, which can be clearly shown at the fornix conjunctiva. Under normal circumstances, the lacrimal gland secretes few tears, and it can secrete 0. 1 ml ~ 0.6 ml a day, which is only used to moisten the conjunctiva and offset the evaporation on the eyeball surface. When sleeping with eyes closed, the secretion of lacrimal gland stops completely. A healthy person secretes about 1000 ml of tears every year. Too many or too few tears are abnormal. Too many tears will not only bring trouble to people's work and life, but also affect their eyesight to some extent due to refraction. Too little or no tears often make the eyeball dry and the cornea cloudy, which is called "dry eye".
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