The Science of Invisibility

In science, there are two ways for invisibility to occur. When a living thing somehow gains invisibility, it loses it's ability to see unless the eyes become visible or the whole body does. This happens because the retina in the back of the eye must reflect light in order to send images to the brain. An invisible retina stops no light. Therefore, invisible beings are blind.
 * 1) Light rays must bend around an object. When this occurs, anything inside the object is invisible too.
 * 2) Light rays must penetrate through an object. Instead of the certain colors of visible light reflecting off an object, they must go through them.