What are the steps in photo reception?

A photon strikes a rhodospin molecule in the membrane disk and when the photon is absorbed a change in the retinal component takes place which activates opsin. Then bleaching occurs in which rhodopsin breaks down into retinal and opsin. The retinal has to be converted back to its original shape in order to recomibine with opsin, which occurs by ATP. Since that happens recovery has to happen where opsin and retinal become one again to recombine into rhodospin in which the arrival of that photon produces an actional potential and begins an impulse along the optic nerve. :)