What opticallenses

This video features Dr. Matt McMahon describing optical illusions and how they play tricks on our eyes. Created on April 30, 2013.

What opticalmeaning

Color blindness doesn't mean that you see in black and white. It means that you have trouble telling the difference between certain colors.

An optical illusion is something that plays tricks on your vision. Optical illusions teach us how our eyes and brain work together to see. You live in a three-dimensional world, so your brain gets clues about depth, shading, lighting, and position to help you interpret what you see. But when you look at a two-dimensional image, your brain can be fooled because it doesn't get the same clues. Take a look at the optical illusions below. Can you figure them out?