The eye is the most important of the human senses, with the help of vision we receive 90% of the information from the world around us. The eyes are a complex optical device and their main task is to transmit an image through the optic nerve to the brain for further processing.
Interesting facts about human vision:
- A person’s pupils dilate by almost 50% if he looks at a person for whom he feels strong sympathy;
- Human eyes are able to distinguish approximately 500 shades of gray;
- Each eye contains 107 million light-sensitive cells;
- The eyes focus on about 50 objects per second;
- The blink will last about 100- 150 milliseconds, and you can blink 5 times per second;
- The eyes process about 36,000 pieces of information every hour;
- You will not be able to involuntarily sneeze with your eyes open;
- The shark’s cornea is as similar as possible to the cornea of human eyes, so surgeons use it as a donor material during operations;
- About 10,000 years ago, all people on the planet had brown eyes, until a person who lived in the Black Sea region had a genetic mutation that led to the appearance of blue eyes;
- Brown eyes are actually blue, but under a brown pigment. There is even a laser procedure that allows you to turn your eyes from brown to blue forever.
Unusual features of human vision
Dominant eye
Each person has a dominant eye that has a wider field of view.
Interesting to know!
80% of people in the world have the dominant right eye.
To determine the dominant eye, do the following:
Connect your palms in such a way that you get a “triangle”.
Select an object a meter away from you and look at it through this triangle.
Close the right eye, and then the left.
The dominant eye will see the object completely, without displacement, and the other eye will see only part of the object.
Afterimage
Human eyes have three types of receptors that perceive three basic colors: red, green and blue. If you look at a color image for too long, the receptors will get tired. By abruptly replacing this picture with a black-and—white one, the receptors will not have time to adapt, as a result, it will seem to you that you are seeing a color image.
Vessels of our eyes
For this experiment, you will need a small piece of paper with a hole in it. Place the paper in front of the bright white monitor screen. Look straight through the hole and shake the sheet slightly. After a while, you will see a dark grid of lines resembling the network that we see on the leaves of a tree — these are the vessels and veins of the eyeball, or rather, the shadow they cast.
The Ganzfeld procedure
To conduct this experiment, you need to turn on the TV or radio with white noise or interference, place the halves of the ping pong ball on your eyes and look through them at the light, take a horizontal position.
After a while, the method will begin to work and the person will experience vivid and complex hallucinations. So some can see horses, other animals, or even talk to relatives who are not alive.
But it should be taken into account that this experiment will be interesting only to people with a developed imagination, who most often see vivid and memorable dreams.