Home » Eye Care Services » Vision Therapy » Exercises and Tools Used In Vision Therapy Exercises and Tools Used In Vision Therapy Vision therapy uses a wide range of tools and exercises that aid in the therapeutic process. Here, you’ll find a few examples of what vision therapists use to help strengthen the visual system. Request A Functional Visual Exam How Can We Help You? 832-415-3662 How The Brock String Exercise Treats Convergence Insufficiency Vision therapy uses different types of exercises to strengthen lagging visual skills. The Brock string exercise is commonly used to treat convergence insufficiency, amblyopia (lazy eye) and strabismus (eye turn).