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There are three portions of time to consider here, The wink, the blink and the twink (no kidding-there was actually a study done). A blink is a controlled movement of the eye and so it's length of time is indeterminate, but the quickest blink lasts for a half second. A blink is a reflex action of the eye and lasts somewhere between 300 and 400 milliseconds. A twink is a reflected particle of light seen in the eye and thusly travels at the speed of light (983,571,056 feet per second) This equates to an infinitesimally small fraction of a second, so it would be fair to say it occurs in about a billionth of a second (which in itself is such a small period of time as to be nearly inconceiveable, but is gigantic compared to the actual time in which a twinkle occurs).

AnswerIf you blink, you will miss it. It is the same as a split second, as if a second could be split into two halves. AnswerAs the dictionary says a twinkle is light reflected from the eye,

Just how fast is the 'twinkling of an eye' ?

1Co 15:52 In a moment, in the twinkling of an eye, at the last trump: for the Trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.

It is not the time it takes to blink an eye: for you to see someone's eyes twinkle, light must travel through the front of their eye, be reflected off their retina, and then exit their eye.

Assuming (for the of ease of calculation) that you are standing close to that person so the transmission time from eyeball-to-eyeball can be regarded as instantaneous, and that a person's eyeball is 2.5 cm in diameter, the light would have to travel a distance of 5cm (or 1/20,000th or 2x10-4 of a kilometer).

Since the speed of light is 300,000 (or 3x105) km/sec, this means it would take or 1/6 x 10-9 seconds (ie 1/2 x1/3 x 10-4 x 10-5 seconds), or 1/6,000,000,000th of a second to make a person's eyeball twinkle: pretty fast.

ANSWER:

The twinkling of the eye is caused by an involuntary, very wide dialation in the eye when a person experiences an intense sexual attraction.

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Q: What is the meaning of 'twinkling of an eye'?
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