Brain Illusions

Your brain is actively editing your senses. You can always see your nose. You have a blind spot in your vision but your brain fills in the missing data. Your eyes actually process visual information upside-down. A lot of sufferers of eye conditions like glaucoma don't realize they have these problems until it's too late because of how the brain fills in the gaps in their vision. That's why it's so important to get your eyes checked out regularly.