Final answer:
When an object is moved closer to the eyes, they perform a movement called convergence, where the eyes point inward towards each other. This accommodative process helps in depth perception and becomes more pronounced with closer objects, requiring the lens to become thicker and more powerful. In contrast, distant vision is relaxed with a less converging lens.
Step-by-step explanation:
When you move an object closer to your eyes, the eyes execute a movement called convergence, where both eyes move towards each other. This movement increases for stimuli that are closer to the subject. The closer the object, the more accommodated your vision is, which requires the lens to be more converging or powerful. This is in contrast to when viewing distant objects, where the eyes are most relaxed, and the lens less converging, described as a state of total relaxation.
The brain, employing the signals from each offset eye, processes the depth and creates a 3-dimensional perception of the world. This sense of depth allows us to determine how far away things are in our immediate surroundings. The phenomenon of objects seeming to shift when viewed from different eyes, known as parallax, also aids in this depth perception, with the effect diminishing as the object moves further away from the observer.