http://en.wikipedia.org/wiki/Human_eye
Dehydration, mental activities, work conditions, room temperature, relative humidity, and illumination all influence blink frequency. Break-up time (BUT) is another major measure of eye irritation and tear film stability.It is defined as the time interval (in seconds) between blinking and rupture. BUT is considered to reflect the stability of the tear film as well.
Dehydration, mental activities, work conditions, room temperature, relative humidity, and illumination all influence blink frequency. Break-up time (BUT) is another major measure of eye irritation and tear film stability.It is defined as the time interval (in seconds) between blinking and rupture. BUT is considered to reflect the stability of the tear film as well.
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