In order to switch focus from one object to the other object, an observer in this situation would have to increase the angle of convergence between the eyes. Hence, the disparity of objects closer than the horopter is called disparity.

Crossed disparity

Explanation:

In order to switch focus from one object to the other object, an observer in this situation would have to increase the angle of convergence between the eyes. Hence, the disparity of objects closer than the horopter is called crossed disparity. crossed dispairity is that there is a difference between positive and negative numbers, that allows our brain to determine if an object is closer or farther from the horopter.Hence, the objects closer than the horopter is called crossed disparity.

i am not in high school so i don’t know