1. The change in light stimulates either the rod or cone cells in the retina.
2. The rod or cone cells then stimulate the bipolar cells.
When there is a change in light, the rod or cone cells in the retina are activated and release neurotransmitters that stimulate the bipolar cells. The bipolar cells then transmit signals to the ganglion cells, which in turn send signals to the brain via the optic nerve. This process ultimately results in the perception of visual images.