The most common type of salt -- is in all your body's fluids: blood, sweat, and tears. Your Tears contains a little less than one percent salt.
Why do my eyes sting when I swim in the ocean but not when I cry???
Because sweater contains about three times more salt than your tears. The higher concentration of salt can cause a mild stinging in eyes even if you wear a mask.
Why do I cry????
That depends on the kind of crying you are talking about. Our eyes produce tears of three types.
1. Basal tears: flow constantly to keep our eyes from drying out. Our bodies produce about five to ten ounces ( 148-295ml) of basal tears each day.
2. Reflex tears: protect our peepers from irritants in the air, such as smoke and dust.
3. Emotional tears: flow when our brain register sadness and stress, which triggers the release of body chemicals called hormones that turn on the waterworks. Some scientists believe that build up during stress-- which is why you feel better after "having good cry". With the possible exceptions of elephants and gorillas, human are the only animals that she tears of this type.
Why do I blink? ??
Humans blink automatically to flush away the stream of cleansing tears produced by ducts in the corners of our eyes. Adults blink about 15 times per minute, but our rate of blinking slow when we read(which is why our eyes tiers after tracking a long book) or focus on a distant object. No matter how hard we try not a blink, the need of flush the eyes eventually trumps our will power -- as anyone who's is lost a staring contest will tell you.
Why do some people need to wear glasses or contacts???
Your eyes are amazing machine, but it take only one small imperfection in the shape of your cornea or the lease to cause fuzzy focusing. Doctors call these imperfections astigmatism, and they are often inherited from parents. Glasses and contact lenses(or corrective surgery) can fix the problem.
Note: Infants blank only about two times per minute.
Why do my eyes sting when I swim in the ocean but not when I cry???
Because sweater contains about three times more salt than your tears. The higher concentration of salt can cause a mild stinging in eyes even if you wear a mask.
Why do I cry????
That depends on the kind of crying you are talking about. Our eyes produce tears of three types.
1. Basal tears: flow constantly to keep our eyes from drying out. Our bodies produce about five to ten ounces ( 148-295ml) of basal tears each day.
2. Reflex tears: protect our peepers from irritants in the air, such as smoke and dust.
3. Emotional tears: flow when our brain register sadness and stress, which triggers the release of body chemicals called hormones that turn on the waterworks. Some scientists believe that build up during stress-- which is why you feel better after "having good cry". With the possible exceptions of elephants and gorillas, human are the only animals that she tears of this type.
Why do I blink? ??
Humans blink automatically to flush away the stream of cleansing tears produced by ducts in the corners of our eyes. Adults blink about 15 times per minute, but our rate of blinking slow when we read(which is why our eyes tiers after tracking a long book) or focus on a distant object. No matter how hard we try not a blink, the need of flush the eyes eventually trumps our will power -- as anyone who's is lost a staring contest will tell you.
Why do some people need to wear glasses or contacts???
Your eyes are amazing machine, but it take only one small imperfection in the shape of your cornea or the lease to cause fuzzy focusing. Doctors call these imperfections astigmatism, and they are often inherited from parents. Glasses and contact lenses(or corrective surgery) can fix the problem.
Note: Infants blank only about two times per minute.
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