Explain Mechanism of vision ?

Dear Student, For vision, bipolar cells are present on retina of eye. These are rods and cons. When light hits rods, Rhodopsin (pigment in rods) converts to Metarhodopsin II. Then this Metarhodopsin II activates Transducin( protein present in eye). This transducin helps in activating phosphodiesterase enzyme and further hydrolysing cGMP(Cyclic GMP). cGMP amount decrease in eye that causes sodium channels to close (only organ of body where Closed sodium channels produce action potential). This closing produces action potential that travel through optic nerve to the brain that helps brain to interpret the image. Regards