why do people blink?

http://whydopeople.net/why-do-people-blink/

Summary: it is something that people do involuntarily. According to experts we blink about once every 5 seconds. There are various reasons why people blink. The most important is to keep the eyes lubricated. The eyelid will keep on blinking until the irritant or foreign body is flushed away, usually with a good amount of tears, especially if the object is hard to remove.

Critique: did realize that our eyes blink a lot every 5 seconds .

Impact: can effect if someone is blind can they cry and blink to get the irritated object out of there eyes.