Optical Fun: American Eagle Eye Exam

National American Eagle Day is celebrated June 20th of every year. This is an unofficial holiday is sponsored by The American Eagle Foundation. The American Eagle is the United States national symbol and was at one point on the Endangered List, although it has been taken off.

June-OF-American EastEye Bogglers on Eagle Vision (Source)

  • Bald Eagles have two foveae or centers of focus, that allow the birds to see both forward and to the side at the same time
  •  Bald eagles are capable of seeing fish in the water from several hundred feet above, while soaring, gliding or in flapping flight.
  • Eagles have eyelids that close during sleep. For blinking, they also have an inner eyelid called a nictitating membrane. Every three or four seconds, the nictitating membrane slides across the eye from front to back, wiping dirt and dust from the cornea. Because the membrane is translucent, the eagle can see even while it is over the eye.
  • Eagles, like all birds, have color vision. An eagle’s eye is almost as large as a human’s, but its sharpness is at least four times that of a person with perfect vision

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