Mysterious Lesser Known facts about Eyes

These facts about human eyes will make you understand the value of gift given to you by nature. Most of us take this precious gift as granted and don't even take proper care of it. However our whole body is a precious gift of nature, but our eyes are most important of them, as we can't look at this nature without them.
Our eyes evolved to capture light, the fastest known thing. We could have evolved to capture sound waves to see, like Bats. It took millions of year to evolve and a lot of natural selection before we become what we are today. Lets learn something more about our mysterious eyes and how they are different from others.

Evaluating Eye in Digital World


  • You must know that each of your eye is a 576 megapixel camera.
  • Human eye can focus on 50 things per second.
  • An average human eye have 2 million working parts.
  • Human eye can detect 500 shades of grey and 10 million different colors.
  • Physiologically human eye has got a frame rate of 1000 frames/sec. But if  videos of different frame rates are played on a screen, then we can't tell the difference after 150 frames/sec.
  • If you have faced "red-eye" effect in photos, then you must know that it occurs due to flash as the light bounces off from the back of eyes where a number of blood vessels exist and make it appear red.

Amazing Colors of Eyes


  • Different Color of our eyes is due to Melanin, which is also responsible for our skin color. Brown eyes means more melanin (which is a dark brown pigment), while blue eyes means lesser melanin which makes it a bit see through and blue colored collagen on the inner end gives them a bluish touch. Very first human with blue eyes existed 6000 to 10000 years ago. 
  • Only 2% humans have green eyes which is caused due to some pigmentation in iris.
  • There are six colors of human eyes which occurs due to pigmentation in iris. These colors are amber, blue, brown, gray, green, hazel and red.
  • Heterochromia is a condition where both eyes are of different colors. Alexander-the-great also had this condition.

Our Brain Sees, not Eyes


  • Each of our eye is connect to our brain through 1 million nerve fibers.
  • Muscles responsible for blinking the eye are fastest muscles in our body, so we don't miss a scene. We can blink our eyes five times in a second. We blink more while talking and lesser while reading. On an average we blink 17 time per minute.
  • To compensate for the frame-loss during blinking our brain generates the intermediate frames, which our eyes actually doesn't see. In total this time is equivalent to 10% of our daily waking hours. So 10% of what we see is actually made-up by our brain, its not real. Our brain is the actual organ that see, eyes are just an input medium.
  • Human eyes actually capture upside down image, our brain flips it to see objects correctly. If you wear some goggles that makes you see objects upside-down for a few days, then your brain can fix this glitch and you will feel normal vision through those glasses.

Some More Facts about Human Eye


  • Light sensitive cells in our eyes are known as rods and cones. There are 100 million Rod cells which make us see in dark, while 7 million cones make us see the color and details.
  • Cone cell are of three types to differentiate red, green and blue.
  • Human eye can detect a burning candle from 30 mile (48 km) distance in a clear dark night.
  • Eyes can heal scratches in 48 hours. It continuously cleans any dirt through blinking.
  • Human eyes are so complex that they can't be transplanted.
  • Cornea of eye is the only living part of body that don't need blood supply. It gets oxygen directly from air.
  • A fingerprint may have 40 different characteristics while an iris have 256 different characteristics, which makes eyes a better option for bio-metric scanning.
  • Night-vision goggles are green because we can see more shades of green than any other color.
  • Our eyes take 15 to 20 minutes to adjust from a bright room to a dark room. This time is roughly equal to the time taken for sun set.

Animal Eyes vs Human Eyes


  • However most of the other animals also have eyes, but they are usually different from humans. Most of the animals rely on their smelling sense to give more clarity to their vision. 
  • There is a misconception that dogs and cats have grey vision, which is not true. Cats have more rods cells, so they see better at night and see lesser colors than humans. Cats can see blue and green, but shades of red are confusing for them.
  • Dogs are also better at night vision and have red-green color blindness. But they can analyse shades of grey better than humans. Dogs are also very nearsighted, but their hearing sense and smelling sense works far better than us, thus we misunderstand that they see better than us.
  • Horse's eyes are similar to dogs but they have a 350 degree monocular vision which gives them the ability to see behind them. But depth perception of horse is not as good as humans.
  • Eagle's eyes are better than humans as they are evolved to track their prey from heights. If our eyes get as better as an Eagle then we can see an ant on ground from 10th floor of a building. Similarly sharks have 10 times better clarity in their underwater vision. Its evolution. Don't feel inferior if you can't see better than an Eagle or Shark. These beings evolved according to their surrounding and need. 

Today humans have extended their vision through telescopes, microscopes, satellites, radars and sonars. With these machines we can even even see those spectrum that we can't see through our biological eyes.
Take care of your eyes and keep scrolling though BetterHealthFacts.com .
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