1Two things to know first
Your eye is a screen of tiny sensors — with one bald patch
You need two small ideas. Watch each one happen:
The back is a sensor grid
The back of your eye is carpeted with millions of light sensors. Light that lands on them becomes a "I saw that!" signal to your brain.
2It depends where the light lands
Same eye — two very different fates
Lands on a sensor 👀
The sensor fires and your brain gets the message. You see it.
Lands on the bare patch 🕳️
Nothing is there to catch the light, so no signal leaves the eye. Keep this in mind…
3Move the light around
Drag where the dot's light lands
Here's your eye from above. The orange light comes in and lands somewhere on the back wall. Slide it across and watch the signal: green when it hits sensors, and what happens when it crosses the bare patch?
signal: ON The bare patch sits off to one side — slide across it and the signal drops to nothing.
4Now find YOUR blind spot
Cover one eye, stare at the cross — then predict
Close your left eye. With your right eye, stare hard at the white cross and don't move your eyes. We'll slide the orange dot slowly toward the cross. Keep staring at the cross the whole time.
Guess before you watch
As the dot slides toward the center of your view, what will happen to it?
Keep staring at the white cross — watch the orange dot with the side of your eye.