With two eyes, humans are able to perceive depth and perceive the world in three dimensions. This is known as stereoscopic vision, where the brain processes the slight differences in the images received by each eye to create a sense of depth and spatial perception.
On the other hand, with only one eye, our perception of depth is limited. We rely on other visual cues, such as relative size, perspective, shading, and motion parallax, to infer depth and create a sense of three-dimensionality. However, the depth perception with one eye alone is not as accurate or precise as with two eyes.
So, while it is possible to perceive some sense of depth and three-dimensionality with one eye, our perception is more robust and accurate with two eyes working together. With one eye, the perception of the world is somewhat flattened, and the experience can be likened to a two-dimensional representation, although it is not strictly a true two-dimensional perception.