why do we have to blink our eyes?

Question

why do we have to blink our eyes?

Answer 1

Blinking distributes moisture across the surfaces of our eyeballs and helps clear away any tiny particles of dust.

Answer 2

blinking lubricates the eyeballs and remove any contaminant particles

Answer 3

do keep our eyes moist, because when they are open, they are exposed to the outside oxygen and dust particles floating in the air.

Answer 4

1.- To spread the moisture of the tears evenly on the surface of the conjunctiva and cornea.
2.-- To keep the surface of both structures mentioned above, free from dust, and thus, dangerous microbial flora
3.- to spread the antiseptic properties of the protein lisozyme, contained in the tears.
4.- to detach those cells of the cornea and conjunctiva, that are recycled everyday, eliminating them with the normal tears
5.- To avoid dehydration and keep the moisture constant on the exposed surface of the eye...

Answer 5

it keeps the front of our eyes wet, which allows oxygen to transfer into the tissue of the eyeball itself directly from the air. The blood vessels in that part of the eye normally do not provide quite enough oxygen, so it's necessary to keep moist.
furthermore, tears tend to become cloudy when they dry out, so keeping your eye moist by blinking helps keep your vision clear, and your eyeballs clean of dust and foreign matter. Furthermore, the inside if your eyelids are covered with a fine network of blood vessels close to the surface, so when your eyes are closed, those blood vessels supply the surface of your eyes with oxygen and nutrients.