Facts

Facts About Your Amazing Eyes

We don’t often give our eyes as much thought as we should; that is until something goes wrong and our vision is affected. But when you learn the facts about eyes, you realize just how amazing they are.

Here are a few facts you may enjoy:

  • Eyes began to develop 550 million years ago. The simplest eyes were patches of photo-receptor protein in single-celled animals.eye-facts
  • Your eyes start to develop two weeks after you are conceived.
  • The entire length of all the eyelashes shed by a human in their life is over 98 feet with each eye lash having a life span of about 5 months.
  • To protect your eyes, they are positioned in a hollowed eye socket, while eyebrows prevent sweat dripping into your eyes and eyelashes keep dirt out of your eyes.
  • Your eyeballs stay the same size from birth to death, while your nose and ears continue to grow.
  • An eye is composed of more than 2 million working parts to make them fully functional.
  • Only 1/6 of the human eyeball is exposed.
  • The human eye weights approximately just under an ounce (28 grams) and is about an inch across.
  • An eye cannot be transplanted. More than 1 million nerve fibers connect each eye to the brain and currently we’re not able to reconstruct those connections.
  • Corneas, the transparent front layer of the eye, are the only tissues that don’t have blood.
  • 80% of our memories are determined by what we see.
  • Eyes heal quickly. With proper care, it takes only about 48 hours to repair a minor corneal scratch.
  • Humans and dogs are the only species known to seek visual cues from another individual’s eyes, and dogs only do this when interacting with humans.
  • A fingerprint has 40 unique characteristics, but an iris has 256, a reason retina scans are increasingly being used for security purposes.
  • People who are blind can see their dreams if they weren’t born blind.
  • “Red eye” occurs in photos because light from the flash bounces off the back of the eye. The retina, the back of the eye, is rich in blood vessels, which make it appear red on film.
  • 80% of what we learn is through our eyes.
  • The most active muscles in your body are in your eyes.
  • If the human eye were a digital camera it would have 576 megapixels.
  • Your eyes contain 7 million cones which help you see color and detail and 100 million cells called rods which help you to see better in the dark.

 

 

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One Comment
  1. Reply
    Larry Lettofsky

    very interesting=thank you

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