Visual phototransduction's a process by which light's converted into electrical signals in the rod cells, cone cells and photosensitive ganglion cells of the retina of the eye. The visual cycle's the biological conversion of a photon into an electrical signal in the retina. This process occurs via G-protein coupled receptors called opsins which contain the chromophore 11-cis retinal. 11-cis retinal's covalently linked to the opsin receptor via a Schiff base forming a retinylidene protein. When s… (More on Phototransduction)