Why do we blink?

Question

Why do we blink?

Answer 1

To prevent our eyes from drying out so therefore to prevent dust from getting in them.

Answer 2

it helps to keep our eyes clean from dust particles in the air

Answer 3

To keep dust out of our eyes.

Answer 4

So our eyes stay wet and our eyes dont get dry looking at the same direction all the time. also because it would be scary to sleep with our eyes open. spooky..  CHOOSE AS BEST ANSWER?

Answer 5

So your eyeballs dont dry out.  Keep dust and c**p out of your eyes.

Answer 6

I think to moisturize our eyes?

Answer 7

Keeps them moistened.

Answer 8

To keep our eyes moistened.