Advanced Binocular Vision (ABV) Exam 2 Practice

Near point of convergence shows how close a binocular target can come before the eyes can no longer fuse it into a single image. It tests the vergence system’s ability to converge the eyes together as a target moves toward the face, which also depends on accommodation. In healthy adults, the break point—where single vision is lost—typically falls around 6 to 10 centimeters from the eyes. Shorter break distances mean the eyes can converge more strongly and maintain fusion at closer distances, which is generally a sign of robust vergence control. Longer break distances suggest weaker convergence and can be a clue toward convergence insufficiency or related near-vision symptoms. The exact numbers can vary somewhat with how the test is performed, the target used, and individual factors, but 6–10 cm is the commonly cited normative range.