Saturday, May 16, 2015

Do Eye-Balls remain same from Birth Until Death

Do Eye-Balls Grow in due course of Age !

It’s a popular myth that the human eye is the only part of the body that remains the same size from birth until death.

When you're born, your eyeballs are each 16 millimeters wide. But by the time you turn three, they will grow to each be 23 millimeters wide. Your eyeballs will reach their maximum size when you hit puberty -- around 24 millimeters wide.

Human eyes grow dramatically in size from birth until about 15 to 16 years of age. The size of the human eye from front to back is about 17 mm at birth, and human eyes grow to about 21 mm by two years of age, and about 23 to 24 mm by the time you reach your teenage years, in which it has grown to about 7/8th of an inch. This eye growth is in the "axial length" of the eye (front to back), and not in the part in which one sees through when looking at something.

Your eyes, ears, and nose all keep growing (at different rates, your eyes end up relatively smaller compared to your face when you reach adulthood as opposed to an infant), until you reach adult size usually around 18 (not puberty). All three (and the rest of your face) then stop growing. So eyes do grow (some 40% increase in size from infant to adult), and ears and noses do stop growing.

So while the human eye is slow to get bigger, it does increase in size by about 7mm (almost 40%) during the course of your lifetime.

Meanwhile, a lot of people think that your nose and ears never stop growing… but this is also an illusion.

Your nose and ears actually stop growing when you are 18 years old. They only appear to get bigger once you hit old age, due to the force of gravity pulling down on your skin.
 

The dimensions differ among adults by only one or two millimeters; it is remarkably consistent across different ethnicity. The vertical measure, generally less than the horizontal distance, is about 24 mm among adults, at birth about 16–17 millimeters (about 0.65 inch). The eyeball grows rapidly, increasing to 22.5–23 mm (approx. 0.89 in) by three years of age. By age 13, the eye attains its full size. The typical adult eye has an anterior to posterior diameter of 24 millimeters, a volume of six cubic centimeters (0.4 cu. in.), and a mass of 7.5 grams (weight of 0.25 oz.).
 
When you’re young, you have plenty of collagen and elastin in your skin which gives it strength and suppleness. But that breaks down with old age, causing skin to lose its elasticity, and your nose and ears appear all big and droopy. They do not continue to grow in old age.