Source:http://linkedlifedata.com/resource/umls/id/C0597663
CSP: process by which light is converted into electrical signals in the rod and cone cells of the retina or other visual organ; conceptually divided into two phases: activation and inactivation.,MSH: The transducing of light energy to afferent nerve impulses in the retinal rods and cones. After light photons are absorbed by the visual photopigments, the signal is transmitted to the outer segment membrane by the cyclic GMP second messenger system, where it closes the sodium channels. This channel gating ultimately generates an action potential in the inner retina.