The eyebrows are positioned along the brow bone to help channel sweat and other liquids away from your eyes. Both the shape of your eyebrows and each individual hair within the brow play a role in this function. Just as wearing false eyelashes can interfere with the natural protective function eyelashes serve, removing too many individual eyebrow hairs in the name of cosmetic appeal can hinder functionality.
Blinking your eyes is necessary to maintain good eye health and lubrication. Did you know that the average adult blinks 10 to 20 times per minute? And that each blink takes just one-tenth of a second? What happens in that millisecond is critically important, though.
Blinking is a natural function that cleans and refreshes your eyes. When you blink, a thin layer of natural tear film spreads across the cornea of your eye. That tear layer keeps the eye moist while whisking away particles of dust or dirt that could irritate the eye and interfere with good vision.
The excess tears and any particles of debris are washed down through your tear ducts into the nasal passages. This connection is also why you probably get a runny nose when you cry — the tear film and nose are interconnected. Though the blinking rate is typically 10 to 20 times per minute, some tasks can be so intense that they interfere with your natural tendency to blink. Over time, less frequent blinking can lead to conditions such as dry eye and eye strain.
Like our eyebrows keep the moisture out of our eyes, eyelashes do the even more important job of keeping out airborne debris , including dust, sand, and dirt. Eyelashes are also highly sensitive and trigger a reflex response. While eyebrows hairs take several months to grow out, eyelashes only take a few weeks, so when they fall out or get pulled out, they replace themselves fairly quickly. The average human has 75 to 80 lashes on the bottom eyelid and 90 to lashes on the top eyelid.
Lashes grow at 0. Eyelash fullness and length varies, depending on genetics. Eyelash trichomegaly is a condition characterized by eyelash length that extends beyond 12mm. This trait can be inherited or may be a symptom of an underlying condition.
In some cases, people with the condition must trim their eyelashes to avoid interference with their vision. So, people with curly hair are likely to have eyelashes with a more dramatic curl, while those with straight hair are prone to having straighter eyelashes. When removed forcefully — either by pulling or rubbing — it takes approximately eight weeks for the eyelash to grow back. Consistently pulling your eyelashes out can traumatize the lash follicle, which may prevent further growth.
The primary function of eyelashes is to operate as a barrier between the internal and external eye. Especially when the eyes are closed, lashes work as a protective curtain to keep the eye moist and shield the cornea from outside elements.
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