Amazing Eye Facts

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Our eyes in facts and figures

  • The human eye can distinguish between 500 shades of grey
  • The human eye can detect 10 million different colours
  • The clear cornea at the front of the eye is the only living tissue in the human body that does not contain any blood vessels
  • The eye is the only part of the human body that can function at 100% ability at any moment without rest
  • Eyes are composed of more than 2 million working parts
  • Under the right conditions the eye can discern candle light at a distance of 14 miles
  • Eyes are the most complex organ apart from your brain
  • It is impossible to sneeze with your eyes open
  • Smoking reduces your night vision
  • Your visual field increases by 10% in the dark because your pupils are larger
  • If you go blind in one eye you only loose around 1/4 of your total vision
  • The average blink lasts 300-400 milliseconds
  • The adult eye contains about 12 million light sensitive cells


  • Babies’ eyes do not produce any tears until they are about 6-8 weeks old
  • Babies cannot blink before the age of 6 months
  • Babies are born with poor colour perception
  • It takes some children up to 3 years to attain their final eye colour


  • Your eyes blink over 10 million times a year
  • Eyes contribute 85% towards your total knowledge
  • 80% of our memories are made up of visual images
  • In a normal life span your eyes will see almost 24 million images of the world around you
  • Your eyelashes have an average life span of 5 months
  • We shed over 30 million eyelashes over our lifetime
  • The lens inside the eye continues to grow throughout life

Make sure you look after this amazing organ and have regular eye tests with a qualified optician.

To request an appointment contact us.

Association of OptometristsCollege of OptometristsGeneral Optical Council
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