This Crazy Optical Illusion Will Disappear Before Your Very Eyes

[JayhawkSD]

16. The article makes a false statement.

"if you focus the retina on one tiny point in your visual field (like a black dot), the retina's light sensitive cells will become used to the unchanging scene..." (emphasis by underline mine)

The sensitivity of the retinal cells never changes. The effect described happens in the brain.

The same thing happens with trueness of color. When the nature of light changes, natural light from the sun versus artifical light, the color of objects changes dramatically. That's why we had to use different films for indoor and outdoor. Our brains compensate for that change automatically, and it happens in the brain, not in the eyes.