25 Interesting Facts About The Human Eye

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interesting facts about the human eye.

The human eye is roughly spherical and about the size of a ping-pong ball. It functions like a camera. Light enters through the transparent cornea, and travels through the colored iris and adjustable pupil. The lens focuses the light onto the retina, a light-sensitive layer at the back. The light is converted into electrical signals that travel through the optic nerve to the brain, creating vision. The outer, white sclera protects the eye, while eyelids and tears keep it clean and lubricated. Read this blog to know some more “Interesting Facts About the Human Eye”

Amazing Facts About The Human Eye

Our eye is considered one of the most fascinating parts of the human body. Some interesting facts about the human eye are as follows:

  • It is believed that eyes were developed in animals around 550 million years ago.
  • Your brain is responsible for turning an upside-down image into a right-up one.
  •  It is possible to blink around 5 times in a single second.
  • Since the eye is the fastest muscle in the body, we say that something happens “in the blink of an eye” when something happens quickly.
  • The human eye can function at 100% at any time without needing any rest.
  • The human eye would have 576 megapixels if it were a digital camera
  • Your blink rate in a year is about 4,200,000 blinks on average.
  •  Eyes heal quite quickly if taken care of properly, a minor corneal scratch can heal in about 48 hours.
  • The first blue-eyed person is said to have lived around 6000-10000 years ago.
  • Every other blue-eyed person on the planet has a common ancestor.
  • Blindness in adults is caused mostly by diabetes.
  • The human eye can trace the light of a candle from around 14 miles away if there are the right conditions and lighting.
  • Despite popular belief, the structure of your eyeball prevents any contact lenses from getting “lost” behind your eye.
  • Our eyes have remained the same size since our birth.
  • It is said that the older we get, the fewer tears our eyes produce
  • Those who are blind but were not born blind are still able to see in their dreams.
  • It is impossible to sneeze with your eyes open.
  • A frequent cosmetic injury is puncturing the eye with a mascara wand.
  • Around 80% of the human eye is filled with a fluid-like substance called vitreous humour that is important to eye health and function.
  • Over millions of years, the features of our skull and face have changed to protect the delicate eyeball.
  • Our eyes have a blind spot that is a small portion of the visual field.
  • The eye colour of a person is said not to affect vision.
  • The scan of the iris is considered much more secure than a fingerprint scan.
  • The condition named as ‘Photokeratitis’ is termed the sunburn of the eye, which is unique and rare.
  • Research indicates that symptoms of computer vision syndrome are present in between 50% and 90% of persons who work at a computer screen.


 How many megapixels would the human eye have if it were a digital camera?

 The human eye would have approximately 576 megapixels.

Can you heal a scratched cornea?

 Yes, with proper care, a minor corneal scratch can heal in about 48 hours.

 Is it true that every blue-eyed person shares a common ancestor?

Yes, genetic studies suggest that all blue-eyed individuals can trace their ancestry back to a single ancestor who lived thousands of years ago.

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