Facts Xtrashots

Blinking of eyes is a natural process but have you ever thought why do we blink our eyes ? What exactly the blinking is ?

Blinking is the rapid closing and opening of the eyelid. It is an essential function of the eye that helps spread tears across and remove irritants from the surface of the cornea and conjunctiva. A person approximately blinks once every two to ten seconds. Some animals (for example, tortoises and hamsters) blink their eyes independently of each other, means they can blink one of the two eyes at a time.

Blinking provides moisture to the eye by irrigation using tears and a lubricant the eyes secrete. The eyelid provides suction across the eye from the tear duct to the entire eyeball so that it will not become dry.

Blinking also protects the eye from irritants. Eyelashes are hairs attached to the upper and lower eyelids. They protect our eyes from dust and harmful elements. The eyelashes catch most of these irritants before they reach the eyeball.

Do you know ?

1. A blink takes approximately 300 to 400 milliseconds.
2. You blink your eyes about 20,000 times a day.
3. An Infants only blink at an average rate of one or two times in a minute.
4. An adult blinks at an average rate of 10 blinks per minute.
5. When the eyes are focused on object for an extended period of time, such as when reading, the rate of blinking decreases to about 3-4 times per minute. This is the major reason that eyes dry out when reading.
6. Our eyes are always the same size from birth.
7. An eyelash lives about 150 days before it falls out.

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