How does the eye work exactly? In the latest video from Decoder, learn some of the extraordinary science behind how your eyes and brain work together to perceive the world around you.

It all starts when Billy Dog realizes that he is having trouble seeing things that are far away. He takes a trip to the eye doctor to have an eye exam, and he gets his first pair of glasses. At first, he was apprehensive and resistant to getting glasses, but afterwards he realizes all the benefits they have!

George grabs an "apple" from the fridge and doesn't realize that it's an onion until he takes a bite out of it. He continues to eat the onion despite knowing it is not the fruit he originally wanted.

Temple, an autistic student, watches a short film on optical illusions and is immediately intrigued by it. She sets out to achieve the effects in the movie and does so after much persistence.

Hip Hop Harry sings about the importance of eyes and how glasses can assist those with poor vision.