The working principle of the eye

Eye working principle is as follows:

Light from objects (eg trees) into the retina (retina) through the eyes of a child (pupil) and eyepiece. Eye lens to form an image on the retina. Shadow objects into the retina is a real image, upside down, and minimized. In order for the incoming shadow apparent, then the muscles of the eyes move automatically (reflex) and thins thickened lens of the eye so that the distance the object being viewed and distance hotspots (focus) can be appropriate.

Power issued by the eye muscle to thicken and diluting the eyepiece is called the power of accommodation. If we look at a near object, the eye muscles to accommodate the eye's lens becomes thicker. Conversely when we look at a distant object, the eye muscles to accommodate the eye's lens becomes thin.