Human Body

45 Surprising Facts About Eyes

The eyes are visual system organs. They give us vision, as well as the ability to receive and process visual detail, and they enable several photo response functions that are not dependent on vision. Light is detected by the eyes and then converted into electro-chemical impulses in neurons that help us see this beautiful world.

  1. On a clear moonless night, the human eye can detect a match being struck from 80 miles away.
  2. The human eye can take in a million simultaneous impressions and can tell the difference between 8 million different colors.
  3. The focusing muscles of our eyes move around 100,000 times a day. If we want to give the same workout to our leg muscles, we need to walk about 80 km every day.
  4. Our eyes count about 576 megapixels that is about 30 times more than an average smartphone camera.
  5. The surface of our eyes, known as the cornea, is the only part of our body that has no blood supply.
  6. People who are long-sighted have small eyeballs compared to people who are short-sighted.
  7. The people whose eye has been removed can suffer from a syndrome known as the phantom eye syndrome; they experience pain, sensations, and hallucinations in the missing eyes.
  8. In the year 2004, some German surgeons invented eyeball jewelry; during this surgery, the membrane is sliced, and a decorated shape is inserted. However, eye specialists from the UK and the US criticized this practice; it could cause scarring and infection.
  9. If we read a novel that is about 100,000 words long or about 300 pages, our eyes will travel under 1 kilometer and about half a mile along with the pages.
  10. Our eyes take about one hour to get accustomed to the dark, But after that, eyes are 100,000 times sensitive to the light as they are in bright sunlight.
  11. Women blink their eyes twice as often as men do blink.
  12. If we could join up all the eyelashes and keep in a line that we lose during our lifetime, they would stretch to about 30 meters (100 feet).
  13. We cannot sneeze with our eyes open.
  14. In 2008 a baby was born in India with four eyes and used to see double.
  15. The brown eyes are actually blue underneath, and they can be turned into blue after getting surgery.
  16. When a person starts to cry, and the first drop comes from the right eye, it denotes happiness, and if it comes from the left eye, it’s pain.
  17. Only 2% of the total population of earth naturally possesses green eyes.
  18. Crying makes us feel better and reduces stress. It also helps to keep our bodies healthy.
  19. Our eyes make about 50 movements every second.
  20. The newborn babies cannot cry with tears for at least three weeks.
  21. There’s actually a blind spot in our vision, but our brain fills it.
  22. People that possess blue eyes have a higher tolerance for alcohol.
  23. The most active muscles in our body are in our eyes.
  24. Tears caused by onions, sadness, or happiness look different under the microscope.
  25. Our eyes blink over 900 to 1,200 times an hour. 14,400 to 19,200 times a day, 100,800 to 134,400 times a week, and between 5.2 to 7.1 million times a year.
  26. WE cannot see our own eyes in motion when we look in the mirror since our eyes move and our brain automatically blocks blurred images, making us blind at these moments.
  27. Our eyes focus on 50 different objects every second.
  28. The thickness on our eyes is only as thick as a few sheets of paper.
  29. Babies tend to have blue eyes when they are born. Melanin and exposure to ultraviolet light are needed to bring out their true color of babies’ eyes. Until then, all newborn babies have blue eyes.
  30. We are visual creatures, as about 90% of the information we receive about our environment comes from our eyes.
  31. Our eyesight is at its sharpest in the middle of the day.
  32. Our eyes have many parts, out of which the black part on the front of our eye is called the “pupil.” It is a little hole that opens into the back part of our eyes.
  33. Around the pupil, the color muscle is called the ‘iris.’ Our eyes may be brown, blue, gray, green, or black that is the color of the iris.
  34. Iris has about 256 characteristics, whereas the fingerprint has just 40.
  35. Our eyes can take in more information than the largest telescope known to man.
  36. Our eyes are the only part of the human body that functions at 100% ability at any movement.
  37. We spend about 10% of our waking hours with our eyes closed or blinking.
  38. If you could save all the times your eyes blink in one life span and use them all at once, you can see blackness for 1.2 years.
  39. When we cry, the reason that the nose gets runny is that the tears stream into the nose from the eyes.
  40. Our eyes are always the same size from birth.
  41. Our eyes never grow, and our nose and ears never stop growing.
  42. We have some natural protection for our eyes. Our eyebrows are made to keep sweat from running into our eyes, while our eyelashes protect us from dirt.
  43. The eyes have the fastest reacting muscle in our entire body. It contracts in 1/100th of a second.
  44. Only 1/6th of our eyeball is visible.
  45. Our eye contains five to seven million receptors for color perception.

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