When contemplating the marvel of eyes, one may envision a spherical ball or liken it to a biological camera. In reality, the eye embodies aspects of both. Across most organisms, the eye stands as a sophisticated optical apparatus, adept at processing light-based information. Objects become visible because they emit or reflect light, and the eye serves as a remarkable biological construct, capable of capturing this data and conveying it to the brain for interpretation. Within organisms, including ourselves, the eye links to the optic nerve, which acts as a conduit for transmitting visual information to the brain. Eyes are intriguing structures that fall into one of two broad categories: 1. Compound Eyes: A compound eye operates by gathering data from numerous visual units, resembling an array of multiple cameras that capture and process multiple images. This type of eye is prevalent in organisms like insects and crustaceans. 2. Non-Compound Eyes: Conversely, a non-compound eye typically relies on a single visual unit, akin to a solitary camera capturing a single image. This design is predominantly observed in mammals and humans. In more advanced organisms, such as humans, the eye exhibits several fascinating traits. These include binocular vision, where two eyes collaborate to perceive a single visual field, and depth perception, enabling the perception of objects at varying distances. However, certain animals like horses possess monocular vision, with eyes situated on separate sides of the head, facilitating the processing of one visual field at a time. Remarkably, these animals often possess the ability to move their eyes independently.