Nine-year-old Dennis enjoyed crossing his eyes for his friends. He was using the same eye muscles that are used in

Question

Quizplus · Accepted Answer

Convergence refers to the ability of the eyes to turn inward towards each other in order to focus on a nearby object. Crossing the eyes involves convergence and using the same eye muscles that are used during convergence to bring the eyes together. Accommodation refers to the ability of the lens to change its shape to focus on objects at different distances. Retinal disparity refers to the differences between the images received by the two eyes due to their slightly different positions. Motion parallax refers to the way objects appear to move at different rates depending on their distance from the viewer. None of these concepts are directly related to crossing the eyes.

Nine-Year-Old Dennis Enjoyed Crossing His Eyes for His Friends