Zombies have milky eyes because they don't blink
Blinking is an involuntary function of the body that ensures that the eyes in their sockets are kept moist and that foreign objects do not damage the surface of the eyes. When closed, the eyelid creates an absorbent film over the entire eyeball to prevent it from drying out. Note: In many zombie films and books, the zombies often have milky colored eyes. This is because these zombies don't blink, and the milky color of their eyes is a representation of the millions of microscopic scratches that would appear on an eye if no blink occurred.
The average person blinks about 11,500 times a day, or about 4.2 million times a year. Although the blink of an eye lasts only a fraction of a second, those fractions add up to half an hour of closing your eyes a day - that's 182 and a half hours per year!
The muscles that control blinking are called the orbicularis oculi and levatorpalpebraesuperioris muscles. The orbicularis oculi closes the eye, while contraction of the levatorpalpebrae muscle opens the eye. These muscles are the fastest moving muscles in the human body!
Many different studies of the frequency of blinking in adults have been conducted in different scenarios. One such scenario was that of the Air Force pilots in a flight simulator flying over either friendly or hostile territory. This showed that people blink more when taking in less information, as demonstrated by Air Force pilots, who blink less when over enemy territory.
Most animals blink the same way as humans, but sharks, some reptiles, and birds blink with a nictitating membrane. This is a translucent or transparent third eyelid that slides over the eye to keep the eye moist while ensuring maximum visibility.
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