From "Perception: Blindness (#2.3)"
What if I told all of you, that your partially blind. That right now you think you see the world as it truly is, but in actuality, you're missing something. It's true. See, every time we open our eyes light shines onto our retina. Nerve cells called photo receptors interpret the light, transmits the information to our brain, and THAT's how we see. But there's a small area on our retina where there are no photo receptors. This is called a scotoma or "blind spot"...