Eyes are the organs that allow us to see the world around us. They work by receiving light and sending signals to the brain, which interprets these signals as images. Each eye has a lens that focuses light, and the colored part, called the iris, controls how much light enters. Our eyes can detect a wide range of colors and movements, helping us navigate our environment. In addition to vision, eyes can express emotions and communicate feelings. For example, when someone is happy, their eyes may sparkle, while sad eyes can appear droopy. The pupil, the black center of the eye, can also change size based on light and emotions, making our eyes a fascinating part of human expression.