Convergence: Convergence refers to how much our eyes turn inward to focus on an object. When an object is close, our eyes converge more than when it's far away.
Stereopsis: Stereopsis is the visual perception of depth produced by binocular disparity. It allows us to perceive objects in three dimensions.
Retinal Disparity: Retinal disparity is another term for binocular disparity and specifically refers to the difference between the images projected onto each retina.