Eye Health

18 Fun Facts about Eyes for 2018

December 31, 2017
eye facts

2017 is in the books!   It’s been an exciting year with the launching of docbeach.com and I’m extremely appreciative of all the positive feedback.  My sincere hope is to continue to bring you valuable information that you can use and share with others.   And, to help you get your sights set on 2018, here’s my 18 Fun Facts about Eyes:

  1. Afraid of eyes?  You may have ommatophobia
  2. The difference between light and dark colored eyes is not the type of pigment but the density of the pigment cells called melanocytes found in the iris.
  3. Polycoria is the condition of having more than one “pupil” in the same eye.  It may be due to trauma or a genetic condition.
  4. The average time it takes to blink is 1/10th of a second.   We also blink involuntarily about 10-17 times per minute depending our visual task.
  5. Newborns cry, but not with tears.   Most of us can produce tears sometime between 4 and 12 weeks of age.
  6. The human eye weighs about 0.25oz.  That’s a little heavier than a single quarter or about 3 pennies.
  7. 80% of our memories are determined by what we see
  8. Glaucoma is a leading cause of permanent blindness in America.  It’s also preventable.
  9. The cornea is the only tissue in the body that doesn’t have blood vessels
  10. The retina contains about 7 million cone cells, which allow for sharp vision and color perception.  There are also 100 million rod cells, which help to see in dark conditions. This is one reason why when it’s dark, we usually see very little colors
  11. Carrots don’t make your eyesight better, but they are good for your eyes.  So are spinach, kale, and vegetables with color.
  12. Cats have 3 eyelids.  Top, bottom, and across.  Ok, so this isn’t about your eyes, but still pretty cool.
  13. Troxler’s Phenomenon is when static images in your vision disappear if they are perfectly still for too long.  Our brain and eyes work together to prevent this from happening by producing microsaccades or tiny jerk movements of the eyes.  These movements are so small we don’t notice them, but they keep images from getting static on our retina and disappearing.   
  14. Your pupils dilate in response to darkness, certain drugs, and someone you think is attractive
  15. The brain receives 2 images:  one from the left eye and one from the right eye.  It fuses them together to give us one “picture” of our world.  If one image is vastly different in angle or size, the brain may suppress that eye’s image to avoid double vision.
  16. The eye’s surface supports a lot of “good” bacteria called normal flora.  They are important to fight off more harmful microorganisms.
  17. There are tear “drains” called puncta on the nasal corner edge of your eyelids.  These puncta drain into the back of the nose.  This is why your nose runs when your cry.
  18. The highest density of pain nerve endings in your entire body is in the cornea, which is the front surface of the eye.  But, there are absolutely no pain nerve endings in the retina, which is inside the eye.

Eyes are pretty amazing, don’t you think?   I hope that you have a wonderful and blessed new year!  Please be sure to check back often for more useful articles in 2018!

Dr. Beach

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