Well, when the photons of light actually hits these photochemicals known as our pigments, what basically happens is we have a conformational change taking place on the proteins inside the membrane of our cells. And that basically increases or decreases the permeability of ions such as sodium ions. So that can either depolarize or hyperpolarize our cell membrane and that can ultimately create our electrical signal, which will basically pass up to our brain through a nerve known as our optic nerve. So once the photons of life hit the rods and cones, this causes conformational change. So the change in our shape of the proteins found on the membranes of our cells, which leads to the production of an electrical signal that shovels up to the brain via our optic nerve. So there are two types of cells that we have to be familiar with when we're talking about this transmission of electrical signals.