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Random Facts about Eyes

4 November 2016

In celebration of the study period coming to an end at University, why don’t we go over some random facts for you to memorise now that you’ve spilled all that knowledge out onto the page of your exam paper?

Here are some facts that you may not have known about eyes:

  • Our eyes have two million working parts, seven million cones which help us see colour and detail, plus 100 million cells that provide our night vision.
  • The average blink lasts for about 1/10th of a second.
  • A key reason eyes become tired at the computer: we blink less often. And yes, sometimes a good nap can help.
  • 80% of all human memories are determined by what we see.
  • Eyes are the body’s second most complex organ after the brain.
  • One reason we may never make it to Mars: long-term space travel can wreaking havoc on astronauts’ eyes.
  • Eye colour is determined by the amount of melanin in your iris.
  • There’s still no successful method of transplanting an eyeball. The optic nerve that connects the eye to the brain is too sensitive to reconstruct successfully.
  • Heterochromia is the (pretty darn cool) condition where your eyes are two different colours.
  • Out of all the body’s muscles, the ones that control your eyes are the most active.
  • Babies are born colour blind.
  • Blue-eyed people have a common ancestor with every other blue-eyed person.
  • During major depression episodes, people see less contrast, making colours seem duller.
  • Smoking reduces night vision.
  • Under the right conditions, humans are capable of seeing the light of a candle 14 miles away.
  • It kind of feels like laser eye surgery (a.k.a. LASIK) has been around forever. But the first procedures in the U.S. took place in 1999.
  • Geckos can see colours 350 times better than a human.
  • To prevent sore eyes, be sure to follow the 20-20-20 rule while working on a computer: look at something twenty feet away from your computer every twenty minutes for twenty seconds.

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RANZCO - The Royal Australian and New Zealand College of Ophthalmologists - The Leaders in Collaborative Eye Care
ASO - Australian Society of Ophthalmologists

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