Let’s look an example to see the difference between them. When a musician plays a note on the piano, its tone and volume characteristics are sensations. If you hear the first four notes and you recognized as part of a symphony, one can say that perception is experienced. The differences between sensation and perception are not clear, but it is considered that in some cases one pass just after the other. It is said that the feeling usually comes before the perception and that functional difference is a simple and easy; in the sensitive process a stimulus is perceived as a door alarm, then analyzed and compared (perception), the information this stimulus gives is resolved with an attitude of alert to any danger or simply a matter of turning off the button accidentally activated the alarm. All of this is the accumulation of great information that is interrelated to reach a conclusion.
Related to the vision world there are many terms that we should take into account. Some of them are Rods/Cones, Trichromatic and Opponent-Process Theories of Color Vision, Afterimages. Rods and Cones are retinal cells that contain chemicals that respond to light. When light strikes these chemicals, they break apart, creating a