20 amazing facts about eyes and vision
• 20 incredible facts about eyes and vision
Although we often take them for granted, our eyes - an amazing thing. Do you know how many shades of gray, we are able to discern, or how many times you blink in a year? Here are some interesting facts about the wonders of our vision and eyes.
Our retina sees the world upside down, and the brain turns the "picture".
To see the world the way he sees your retina, you need to wear prism glasses.
In addition, the image goes to the retina divided into two parts and distorted.
Each half of the brain receives one half of the image, and then collects all the picture you are accustomed to seeing.
The retina does not perceive the color red.
Although the retina has receptors are red, green and blue colors, "red" receptors accept only the yellow-green, and the "green" blue-green. Brain sochetatet these signals and converts them into the red.
your peripheral (side) vision is very low resolution, and it is almost black and white.
We do not notice this, because during eye movements peripheral parts are filled before you notice a difference.
You have blue eyes? All blue-eyed people in the world one ancestor.
You have brown eyes? All people on the Earth were originally brown eyes.
Blue eyes appeared as a mutation about 6000 years ago.
If you are blind, but were born with normal vision, in my dreams you still see the image now.
When you started reading this sentence, you missed the 6 times.
On average we blink 17 times per minute, or 5, 2 million times a year.
If you are nearsighted, your eyeball is longer than normal.
If you suffer from farsightedness, it is shorter than usual.
Your eyes are almost the same size as at birth.
Newborns can see at a distance of about 38 cm.
This is about the distance at which the mother's face while feeding.
Your tears become a different composition depending on whether the hit mote if you cry or yawn in the face.
Your eyes constantly make quick, abrupt movements, called "microsaccades" that objects do not disappear from your view.
A process called "Troxler effect" makes static objects disappear when you look at them for too long. Microsaccades prevent it.
The eyes use 65 percent of the brain resources.
The most used muscles in the body - eye.
They actively any other muscle in your body.
giant squid have the largest eyes in the world.
Fear of the eye called ommatofobiya.
The seat at the computer does not hurt the eyes, it overstrains eye muscles.
Your eyes are able to distinguish about 50,000 shades of gray.
flashes of light that you see when you are rubbing their eyes are called phosphenes.