Why do tears come out of our eyes when we cry
It is all because of our lacrimal system that sits next to our eyeball.This system acts as both a secretory system (that produce tears) and an excretory system (that drains them).
When a tear is produced from lacrimal gland(that is present between eyeball and eyelid),we spontaneously blink, spreading the tear as a film across our eye.
Our tear then has 2 fates either it will remain there only, giving a blurring vision for a while or;
It can drain off down, subsequently draining through your nose(hence why our nose runs when we cry).Finally you start crying!
Our lacrimal drainage system simply can not deal with volume of tears. “The resultant excess of fluid now cascades over your eyelids and down your cheeks.”