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        NEI Ask A Scientist Series

        Learn about interesting vision-related topics like color blindness and optical illusions in this video series from scientists at the National Eye Institute, part of the National Institutes of Health.

        Ask a Scientist: What is color blindness?

        Dr. Sheldon Miller explains why some people are color blind while video simulations show how the world looks to a person who is color blind.

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        Ask a Scientist: What is an Optical Illusion?

        Dr. Matt McMahon explains how an optical illusion works.

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        Ask a Scientist: Why Did You Become a Scientist?

        Dr. Pat Becerra of the National Eye Institutes discusses why she decided to become a scientist.

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        Ask A Scientist: Eyes at Night

        Dr. Cheri Wiggs explains what our eyes do while we sleep and why we can't see colors well in the dark.

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        Ask A Scientist: Nearsighted or Farsighted

        Dr. Cheri Wiggs talks about what happens to our eyes when we cry and what it means to be nearsighted or farsighted.

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        Ask a Scientist: Eye Myths and Facts

        Dr. Emily Chew sheds light on common eye-related myths to tell us fact vs. fiction. Learn whether looking at a computer screen or reading in dim lights hurts your eyes, if you might inherit the same eye problems as your parents, or if looking at the sun will damage your eyes.

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        Ask a Scientist: Underwater Eyes

        Dr. Michael Steinmetz explains why salt water stings our eyes, why it does not sting whales' eyes, and whether opening our eyes in a pool is harmful.

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        Ask a Scientist: All Eyes on Animals

        Dr. James Raber answers questions like why all animal eyes don’t look the same and if dogs see the same way humans do.

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        Ask a Scientist: Sharks and Barks

        Dr. James Raber answers whether fish have eyelids and if animals get blurry vision.

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        Ask a Scientist: Perfect Vision and Glasses

        This video features Dr. Rachel Bishop explaining the concept of "perfect vision," how glasses work, and how we can tell if we need glasses.

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