The average blink lasts for about 1/10th of a second.
You blink about 12 times every minute.
Your eyes are always the same size from birth.
Seeing is such a big part of everyday life that it requires about half of the brain to get involved.
Newborns don’t produce tears. They make crying sounds, but the tears don’t start flowing until they are about 4-13 weeks old.
Out of all the muscles in your body, the muscles that control your eyes are the most active.
The cells in your eye come in different shapes. Rod-shaped cells allow you to see shapes, and cone-shaped cells allow you to see color.
Each of your eyes has a small blind spot in the back of the retina where the optic nerve attaches. You don’t notice the hole in your vision because your eyes work together to fill in each other’s blind spot.
Doctors have yet to find a way to transplant an eyeball. The optic nerve that connects the eye to the brain is too sensitive to reconstruct successfully.
Even if no one in the past few generations of your family had blue or green eyes, these recessive traits can still appear in later generations.