If you focus on your fingertip and bring it toward your eyes until they almost cross, you will actually feel _____ as the muscles that control eye movement working harder as your fingertip gets closer.
A)habituation
B)linear perspective
C)convergence
D)overlap

Question

Quizplus · Accepted Answer

Convergence is the inward movement of both eyes that occurs when focusing on nearby objects. It is controlled by the medial rectus muscles of the eyes, and as the object gets closer, the muscles work harder to keep the eyes pointed at the same spot, giving a feeling of strain or effort.

If You Focus on Your Fingertip and Bring It Toward