How the Eyes Turn Light Into Vision

Light enters through the cornea, bends, and focuses on the retina.
Photoreceptor cells—rods and cones—convert light into electrical signals.
Rods see dim light; cones see color and fine detail.
The optic nerve carries signals to the brain’s visual center.
Each eye flips the image upside down; your brain corrects it.
Vision relies on constant micro-movements to keep scenes clear.
The fovea is your retina’s high-definition hotspot.
Your brain fills in blind spots—you never notice them.
Color perception depends on how three cone types overlap.
Vision is part physics, part neuroscience—and entirely interpretation.