Viewing organ is a term used to refer to the EYE, which is a three-letter word. The EYE is an organ of the human body that is responsible for vision. It is made up of several parts, including the cornea, iris, lens, and retina. The EYE is able to detect light and convert it into electrical signals that are sent to the brain, allowing us to see. The EYE is also able to adjust its focus to different distances, allowing us to see both near and far objects.