How does an eye work? How do our brains try to interpret the information our eyes send them? And is seeing really believing? This episode of National Geographic‘s Decoder explains how our eyes and brains work together to process the visual information around us, and how our brains help fill in the information we’re missing.

Related reading: Peripheral vision and the Fovea centralis.

Fun fact: Because of blinking “your eyes are technically closed for roughly 10% of your waking hours.”

Watch more videos about eyes, brains, perception, and the human body, including The Stroop Test, You Can’t See This (Mind Tricks), can you trust your eyes? and how do your eyes perceive color?

Plus: Close ups of the human eye.

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