Our eyes today are one of the most complex organs in our body. How our eyes absorb light and transform it into crystal-clear images has become one of the most debated topics today, as no one has ever fully studied and researched the eye. Therefore, my question was, “How does red eye occur and how does it apply to the two main factions of the eye structure?” Thanks to in-depth preliminary research I discovered a lot about the structure of the eyes and how to perceive vision from another point of view. The general eye can be classified into two main types: the simple eye and the compound eye. The simple eye, the one we have, mostly looks like this: In the diagram above, the main light-sensing organs are labeled. When light enters the eye, it must first pass through the cornea and pupil, which is like a window where light is filtered and flooded. Then, the light is filtered again by two walls called the iris, which detect color and send these messages to the brain. The light continues to pass until it hits the retina, or the posterior mucosa of the eye, which acts as a sort of screen on which to place the image. Here the nerve sensors take the image in the form of impulses and send it to the brain. Related to my main question, I would like to talk about red eyes and eye shine in general. Red-eye appears in photographs taken with flash in dimly lit areas, such as an aquarium or a movie theater. This happens when the bright light from flash photographs illuminates our pupils like light pouring into a room, allowing us to peek inside. The red color comes from the blood vessels inside our pupil. In vertebrates such as dogs, cats, bats, and owls, a mirror gland called the tapetum lucidum lines the retina, which reflects… the center of the paper… the pupil hole. By examining a rented piece of calcite, I was able to discover how the structure of the compound eye cannot function and how it cannot successfully reflect light at a direct angle. In conclusion, my conclusion is that the red eye only applies to eye structures with reflective surfaces, such as the simple eye. Compound eye structures are conical and have a layer of graphite, incapable of reflecting light but needing to absorb only direct light to produce a given image. Our lives sometimes depend on our eyes. Imagine covering your eyes and crossing a busy street. By analyzing the red-eye effect and how it applies to our lives today, we can use it to our greatest advantage. For example, eye doctors shine bright lights into our eyes to look inside us without harming us. This type of research can lead to major improvements in laser surgery and safer eye habits.