The Brock string is often used in vision therapy for patients with vergence disorders such as Convergence Insufficiency, patients with Amblyopia (also called Lazy Eye), and for patients with Strabismus. This is important because these problems can contribute to headaches, blurry vision, balance problems, and more, but these can also be symptoms that can be caused by a concussion. The Brock String Test really looks at two different things: convergence and suppression.

Convergence is when both eyes are looking forward and an object is moving closer and you have to almost cross your eyes. If you are not converging, then one eye remains looking forward instead of meeting with the other eye. If this is one of your problems, then you may be seeing double.

Suppression is when your brain has decided to ignore the signals from one of your eyes which are being transmitted to the brain. In this case, you will just see one field of vision, and it may influence your balance and your peripheral vision.