Interesting facts about the Eyes

  • Your eyes are not only the windows to your soul but also to your health. Many healthcare professionals can see signs of chronic diseases such as high blood pressure, cholesterol and diabetes by taking a look at your eyes.
  • The left side of the brain receives information from the right eye and the right side of the brain receives information from the left eye.
  • We all have a blind spot in our eyes. This spot has no photoreceptors and is where the optic nerve and blood vessels exist. We don’t notice this blind spot because our brain ‘fills it in’.
  • We have a visual field of 200 degrees; both eyes are synchronously used to see 120 degrees (binocular vision) and then each eye independently sees an additional 40 degree view.
  • We use two different light sensitive cells for vision; cone cells provide us with sharp colour vision during the day and rod cells give us distinct grey vision at night.
  • The eyes visualize things upside down and the brain inverts the picture the right way up
  • A baby’s eyes can see colour from the moment they are born but it’s not until a couple of months later that they can distinguish between similar tones.
  • A baby’s eyes are already about two-thirds of its adult size and will only grow a little more unlike its other body parts that will grow at a phenomenal rate.
  • Your nose gets runny when you cry because the drainage system of your eyes involves your nose.
  • Tears aren’t just blobs of water; they are composed of three different layers: oil, water and mucus.
  • Ever wondered why your tears taste salty? The salt in the watery layer of tears is important for cleansing and flushing away irritants and debris from the eyes.
  • A person on average blinks 18 times a minute. The average blink lasts 0.3 seconds, so during the day, in a 16 hour period, you blink 17,280 times which adds up to almost two hours of the day spent blinking!
  • You blink less often when you’re concentrating than when you’re anxious or stressed which is why your eyes might feel sore from reading.
  • The colour and pattern of your iris is unique to you and is a more accurate identification tool than your fingerprint
  • You can inherit two different coloured eyes, this is known as heterochromia.
  • The white part of your eye is connective tissue and it circles around your entire eye ball to keep its shape together.
  • Carrots are good for your eyes because they contain vitamin A. This nutrient is needed by rods and cones for the synthesis of their photo-pigments. If you are deficient, you’ll first experience night blindness.
  • Your eyes blink when you sneeze as a reflex reaction to protect the eyes. However, some people can sneeze with their eyelids open!
  • The eyeball weighs approximately 7 grams which is the weight of a cherry and is roughly half the size of a ping pong ball.
  • An eyeball may weigh and look small but there are six muscles controlled by the brain that move it; four muscles direct it up or down, one muscle pulls to the left and another to the right.
  • Humans can only see visible light (from red to violet) which is only a small portion of the entire light spectrum. Some animals can see an entirely different world of colours- butterflies, reindeers, bees and insects are just some of the animals that can see ultraviolet light (beyond violet).
  • Colour is in the eye of the beholder- some individuals may lack a particular type of light sensitive cell or their cells can respond differently from the norm hence they perceive colours differently, a condition known as colour blindness.
  • Colour blindness is a sex-linked trait which is why males are more affected than females. The degree of colour blindness can vary from failing to distinguish between shades of a colour to only seeing shades of grey.
  • You get sore eyes from crying because ‘emotional’ tears are very watery so when you cry, they wash away your eyes ‘normal’ lubricating tear films.
  • Birds of prey have 3-4 times better resolution than humans!
  • A major cause of dry eyes are hormonal changes, which is why post-menopausal, pregnant and menstruating women are most likely to experience dry eye discomfort.

 

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