How Blind Eyes Sense Daylight

Can you "see" the light even if you are completely blind? It sounds impossible, but your circadian

system has its own private set of sensors. These are specialised retinal cells that contain a photopigment

called melanopsin. Unlike the rods and cones we use for vision, these cells detect

blue light specifically to tell the brain when it is day or night. This is why even

people with no visual awareness can often still synchronise their internal clocks to the solar cycle.

Your brain isn't just looking at the world; it is measuring light to decide exactly

when to wake you up. We are diving deep into the hidden sensors that run

your life. Catch the full episode today.