How Your Eyes Work
When light enters in through the black dot in your eye, your pupil, it makes its way to the back part of the eye, called the retina. The retina is full of photo sensors that then take that light and send messages to the brain along the optic nerve. The optic nerve is a cord that runs from the back of the eye to the back part of our brain. We may think that we just see things with our eyes, but it’s much bigger than that! The brain processes the information received from the eye and then tells us what we are seeing. So really, we see with our brain - we just use our eyes to collect the information. This is how many optical illusions can work. Our brain wants to make sense of the information the eyes collect. Sometimes our brain tries to fill in the gaps of what it is seeing with an “educated guess.” But sometimes that “guess” doesn’t quite make sense.
Try this activity and then ask your eye doctor what they know about optical illusions the next time you’re at your optometrist!