Incredible Facts About Human Eyes That You Don't Know

Everyone has heard that the eyes are the mirror of the soul. In this article, learn more about human eyes. Amazing facts that will surprise you and we bet you did not suspect.
Last Updated
January 30, 2020



Humans see the world better than many animals

Biologists from Duke University in the United States conducted an experiment and evaluated details that look sharp to people who may be blurry to their pet's vision of about 600 species of insects, birds, mammals, fish, and other animals.

The study showed that people's vision is sharper than that of dogs and cats (they see everything in unsaturated colors), rats (they see everything blurred and in blue-green shades), and even flies (the world for them is a giant slow-motion mosaic).

A person is much better at distinguishing small details.



Each person's iris is unique

Some people may have similar eye color, but the pattern on the iris is never repeated, as are fingerprints.

Previously, this feature of the iris made it convenient for biometric identification. But in the last decade, and even more, a reliable method has been invented.


The cornea is even more distinctive

Although the iris has established itself as a unique part of the human eye, authentication is not completely reliable. The fact is that, like the skin on your fingertips, the color of the iris can be changed with surgery. For example, the American doctor Greek Homer developed Laser procedure can turn brown eyes blue a method of turning brown eyes into blue using laser surgery.

At the same time, Dr. Celia Sanchez‑Ramos of the Complutense University of Madrid received the main prize of the invention Exhibition in Geneva, proving "La córnea es la parte del cuerpo más fiable para autenticar la identidad de los individuos" in her report that the cornea is the most reliable part of the human body for establishing its identity.




Eye color depends on the amount of melanin

The iris is responsible for the color of our eyes. It has special cells (chromatophores) containing the pigment melanin, which shines through the cornea.

Its amount determines the color: if there is a lot of melanin, the eyes will be black or brown, if it is little - green or blue. Among people and animals, there is also a red-eye color, it happens in albinos. They completely lack melanin, so the color of the eyes is determined by the blood in the vessels of the iris.



Contact lenses were invented much earlier than you think

The first soft contact lenses were released in 1971 by Twenty‑five years of contact lenses: the impact on the corner and ophthalmic practice by Bausch + Lomb. Now lenses are made of high-tech materials: for example, silicone-hydrogel or hyper gel. Due to this, they retain moisture well and pass oxygen.

A prototype of modern contact lenses was discovered among the sketches of Leonardo da Vinci. The scientist experimentally found that the optical system of the eye can be improved by contacting the cornea with water. He placed the face of a person with poor vision in a basin of water, and this person was able to see clearly for the first time.



A few more interesting facts about eyes

A few more interesting facts about eyes


  • Every 12th male have daltonism (is color-blind).

  • Women blink about twice as often as men.

  • In the Netherlands, you can get an eyeball piercing (see the photo above). A procedure is performed to implant a precious piece of jewelry, such as a tiny heart or star.

  • You can't sneeze with your eyes open.


And more:

  • the eye weighs about 8 grams
  • brown eyes are actually blue with brown pigment

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