Eye Facts for Kids

A Picture of the Human Eye
  • Organ Name: Eye
  • Organ System: Visual System (sensory nervous system)
  • Organ Purpose: Sight
  • Organ Count: 2, left eye and right eye
  • Organ FMA ID: 54448
  • Organ TA ID: A15.2.00.001 and A01.1.00.007

23 Eye Facts for Kids

  1. The eyes are an organ that allows humans to have vision and see things.
  2. Humans have two eyes, the left eye and the right eye.
  3. The human eye has around two million working parts to help you see.
  4. Eyes are part of the sensory nervous system, which is part of the human nervous system.
  5. The human eye can tell the difference between about 10 million colors.
  6. The average height of an adult human eye is 0.93”.
  7. The average width of an adult human eye is 0.95”.
  8. The average depth of an adult human eye is between 0.86 and 0.97”.
  9. The average human eye weighs less than an ounce (0.98 oz.).
  10. The human eyeball reaches it full size by the age of 12 years old.
  11. There are three layers or coasts that make up the human eye and they are the outer layer (fibrous tunic), the middle layer (vascular tunic) and the innermost layer (retina).
  12. The outer layer of the eye (fibrous tunic) contains the cornea and the sclera.
  13. The middle layer of the eye (vascular tunic) contains the choroid, ciliary body, iris and the pigmented epithelium.
  14. The innermost layer of the eye contains the retina and blood vessels.
  15. The human eyes blink between 15 and 20 times a minute. That means you blink up to 1,200 times per day and over 10.5 million times a year.
  16. Someone who is shortsighted has an eyeball that is larger than normal and is unable to see things clearly far away.
  17. Someone who is farsighted has an eyeball that is shorter than average and is unable to see things clearly close-up.
  18. The human eyes can be one of sixteen different colors according to the Martin scale.
  19. The Martin scale has eye colors from light blue to dark brown-black.
  20. The most common eye color worldwide is brown.
  21. A human can have two different color eyes, and this is called heterochromia iridum or heterochromia iridis.
  22. The Foundational Model of Anatomy ID for the eye is 54448
  23. The Terminologia Anatomica IDs for the eyes are A15.2.00.001 and A01.1.00.007.

Additional Resources on the Human Eyes