Sometimes you can tell that an object is close to you because you have to pull your eyes toward the center to focus on the object. This cue to distance is known as

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Convergence is the ability of the eyes to turn inward in order to focus on objects that are closer to the viewer. When an object is close, the muscles controlling the eyes must work harder to focus on the object, causing them to converge. This cue to distance is known as convergence.

Sometimes You Can Tell That an Object Is Close to You