Monocular cues are visual signals that help us perceive depth and distance using just one eye. These cues include aspects like relative size, where objects that appear smaller are perceived as farther away, and interposition, where one object blocking another indicates that it is closer. Other examples are texture gradient and linear perspective, which provide information about the spatial arrangement of objects. These cues are essential for understanding our environment, especially when binocular vision is not available. They allow us to navigate and interact with the world effectively, enhancing our ability to judge distances and sizes of objects, even with one eye closed.