im trying to understand how photons allow the brain to create an image. I understand that light is made up of photons. These photons are emitted from an energy source and reflect off an object and hit the retina which produces electrical signals that the brain creates an image from. What i dont understand is how the photons transfer the information of say a tree to the eye. What changes from just before the photon hits the tree to just after? what allows the photon to transfer the information of the tree to the eye/brain?