More Than 90% of Us See This Phenomenon.

My First Encounter with Phosphenes

A glimpse of how the brain paints motion when no photons enter the eye.

One night, when I was younger, I woke up in my dark room with my forehead pressed into the pillow. As I lifted my head and opened my eyes, I saw about twenty glowing squares, each one linked to the other, shining with a strange burning light. For a moment, I thought I was so special that the aliens and their mothership had finally come to take me away. But then, future me, interrupted the drama: Nooo… it’s just phosphenes.

What are Phosphenes

Phosphenes are those little sparks or shapes of light you see even when your eyes are closed. They don’t come from outside (no lamp, no screen, no sun). Instead, they come from inside your eyes and brain. Scientists say it happens because your eye’s cells send signals to your brain as if they saw light, even though no light actually entered.

The Science Behind it

Your eyes don’t stay quiet when the lights go out. Inside the retina(the thin layer at the back of your eye), cells wait for light to hit them. But they don’t always play by the rules. Push on your eyelids, move your eyes too fast, or let electricity tickle the nerves, and these cells fire signals anyway. The brain receives those signals and says, “Light!” — even though no light ever came in.