Blue Field Phenomenon
Seeing inside your eyes: the dance of the blood cells.
🧐 What do you see?▼
Stare at the blue rectangle. For many people, tiny bright sparkswill appear to squiggle and zip across the visual field, following winding paths and then disappearing.
🧠 Why this works▼
This is also known as the Scheerer Phenomenon. These sparks aren't on the screen—they are simulations ofWhite Blood Cells moving in the capillaries of your own retina.
Blue light is absorbed by the red blood cells that normally line your eye, but it passes through the white blood cells. These "gaps" in the blood supply are perceived as bright, moving dots.