Eyesight> To see anything, you need light. But having light around is not enough. The light has to enter your eyes. Your eyes use light to make a picture of what you are looking at. What are the sources of light in your room? A light bulb? Sunlight through a window? Your computer screen? Don’t look at them for a moment. Turn your head toward a wall without a light source.
Without seeing a single source of light directly, you can still see things around you. The reason: Light in the room bounces off objects, such as the wall, and then travels into your eyes.
Your eyes are little “collectors” of light. Move your head left and right. Wherever you point your eyes, they collect a bit of the light coming from that spot. That light makes the image that you see.
