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Blinking keeps your eyes from drying up, by recovering them with moisture. The moisture, in the form of tears coats the eye which protects it from dust, etc. In conjunction with this, blinking also works to protect your cornea (the colored bit) and conjuntiva (the white bit) from dust and debris by sweeping it away.
It’s why you blink in dust clouds. Your body is trying to protect the eyes from the potentially damaging dust.
Source(s): http://en.wikipedia.org/wiki/Blink
To stop your eyes from drying out and to stop bits going in them.(Although times out of it’s an eyelash that gets in your eye!)
We blink as frequently as every four to six seconds. In fact, blinking happens so quickly that it doesn’t obstruct our vision. But what purpose does blinking serve?
The eyelids are folds of skin controlled by muscles that can expand and contract very rapidly. Between our eyelashes, just inside the rims of the eyelids are – sebaceous glands as well as tear glands. When we blink, these glands secrete lubricants that prevent the eyes from drying out. Each time the eyelids close, salty secretions from the tear glands sweep over the surface of the eye, flushing away small dust particles and lubricating the eyeball. Our eyelashes serve as dust catchers, because the reflex action of blinking automatically causes them to lower when exposed to some kind of foreign particles.
If you are in irritating conditions such as a smoke-filled room, you blink more frequently to keep the eyes clean and moist. You should also blink more often, even consciously, if you wear contact lens or sit before the computer screen for long periods of time.
Yet another benefit of blinking, is to shield the eye from foreign bodies. Our eyelashes, short, curved, hairs, attached to the eyelids, serve as dust-catchers, as the blinking reflex causes them automatically to lower, when exposed to harsh elements. Nature endowed the camel with extraordinarily long, curly, eyelashes, to protect his eyes from sudden sandstorms in the desert. Incidentally, the “camel eyelash” look is one many women attempt to duplicate by using an eyelash curler! Eyebrows, by the way, also serve their purpose, as they catch the run-off perspiration produces.
PERHAPS THE more interesting thing about blinking is that we do it more frequently than is necessary to cleanse and moisten the cornea. Infants, for example, blink once every minute or so, but adults blink an average of to times a minute. This has lead scientists to discover other, more psychologically influenced reasons for blinking as frequently as we do.
Research has shown that when information acquisition is important, we actively inhibit blinking. We blink more often when we are not taking in and processing information. In this way, blinks are like punctuation marks of the mind, signaling a pause in the activity in your head.
For example, when reading interesting material, we blink an average of three to eight times per minute as opposed to times per minute when we are not engaged in an attention-demanding activity. We are also most likely to blink as our eyes shift from one page of text to the next or from the end of a line of text to the beginning of the next line. This phenomenon has also been demonstrated with auditory input when someone is listening attentively and thus is not unique to visually presented information.
One blink isn’t always like the next. Scientists have shown that frequency and duration varies under different conditions. Air Force pilots flying simulators over “friendly” territory have been shown to blink more frequently and to have longer closure durations of the eyelids than when flying over “enemy” territory. In the latter case, information acquisition is more important, and the pilots blink less frequently and more crisply. Pilots inhibit blinking the most when they have been “painted” by enemy radar and are attempting to find and evade missiles or while landing an aircraft.
There is also a relationship between blink frequency and one’s emotional state. Someone who is tired will blink more frequently and for a longer duration than someone who is well rested.
And during the Watergate hearings, for example, President Nixon’s blink rate markedly increased when asked a question that he was not prepared to answer.
Source(s): http://www.soundmedicine.iu.edu/archive//myste…
To flush away the tiny dirt that gets into your eyes, also, to moisturize our eye balls
to stop our eyes drying out
To moisurise your eyeballs, and remove minute debris
to kepp our eyes wet so they dont dry out
to cleanse eye perhaps
Source(s): me
becuase if we didn’t our eyes would dry out
Source(s): my granny told me
we do this to stop our eyes from becoming dry and irritated.