Description
Plastic
Beads
Nylon
String
Beads
wood
Therapeutic
heavier cords
How to use for
- The Brock String is a classic, high-feedback vision-therapy tool for building convergence control, eye-teaming, and anti-suppression. With colored beads placed along a 10-ft string, patients learn to keep a chosen bead single and clear while seeing the string form a correct “X” (two strings entering the bead and one string continuing behind it). This instant visual feedback makes drills easy to teach, progress, and track—both in clinic blocks and supervised home programs.
- What it trains: Convergence range & recovery, binocular alignment, suppression awareness
- How to use (quick start): Fix one end at nose → place beads at near/mid/far → look at a bead → confirm X-pattern and single, clear bead → shift to another bead
- Progressions: Start with larger spacing → move beads closer (increase demand) → add timing (reps/min), alternate near↔far, or incorporate ± flippers
- Feedback cues: Correct X at the target bead; if one side of the “X” disappears, that eye is suppressing; if the bead doubles, reduce demand and rebuild
- Who it suits: Children to adults; ideal for convergence insufficiency workups, VT programs, and sports-vision warmups
- Great pairings: Barrel/dot convergence cards, Red-Green bar reader (to monitor suppression), fixation stick or metronome for pacing
- Session tips: Keep posture steady, breathe and blink normally; log reps, time, break/recovery to track progress week-to-week
- Care: Keep the string untangled and clean; store the beads snug on the cord; avoid sharp bends to preserve alignment and visibility
Durability
- Durable for repeated use; easy to clean for hygiene Durable cord or rope resists stretching so that the length/distance proportions remain stable.
- Beads need to slide freely but also reliably (not too loose), and the string should keep tension without breaking. Heavier cords for longer use. (Bernell’s “Heavy cord” model is an example.)
- Exercises should not provoke severe headache or increase existing headaches.
- Some mild dizziness or visual discomfort is expected but should remain tolerable (below moderate threshold) and under professional supervision.
| Topic | Details |
| Catagory | Vision Therapy |
| Material | Beads: Durable plastic beads in different colors for easy visual identification. String: Strong nylon cord, typically white to provide high contrast with the beads. The cord is flexible yet firm enough to maintain tension during therapy exercises. |
| Item Weight | Lightweight design, making it easy to carry and suitable for repeated use during therapy sessions. |
| Length | The Brock String is typically available in lengths ranging from approximately 5 to 15 feet (1.5–4.5 meters) depending on the therapy requirement. Different lengths allow clinicians to adjust the difficulty level and training distance. |
| How to use for | One end of the string is placed at or near the patient’s nose while the other end is fixed to a stationary point such as a wall, door handle, or held by another person. Colored beads are positioned along the string at various distances. When the patient focuses on a bead, the bead should appear single and clear, while the string appears as two lines forming an “X” pattern at the fixation bead. This visual feedback helps monitor eye alignment and binocular coordination. |
| Includes Comp. | The product typically includes a nylon string and multiple movable colored plastic beads that can be repositioned along the cord to adjust training difficulty. |
| Purpose | The Brock String is used to develop binocular vision skills, particularly convergence control, eye teaming, and suppressioThe Brock String is used to develop binocular vision skills, particularly convergence control, eye teaming, and suppression awareness. It is widely used in vision therapy programs to help treat convergence insufficiency, binocular coordination problems, strabismus, and certain cases of amblyopia.n awareness. It is widely used in vision therapy programs to help treat convergence insufficiency, binocular coordination problems, strabismus, and certain cases of amblyopia. |
| Bead Diameter | Beads typically measure approximately 1.5–2.0 cm in diameter, large enough to be easily visible during fixation exercises. |
| Durability | Constructed with durable nylon cord and sturdy plastic beads, allowing repeated clinical or home therapy use. The materials are easy to clean and designed to maintain consistent tension and bead movement along the string. |
| Unique Selling Proposition (USP) | The Brock String provides instant visual feedback, allowing patients and clinicians to easily observe whether the eyes are properly aligned. It is a simple, cost-effective, and portable tool that requires no electricity and can be used both in clinics and for supervised home therapy exercises. |
| Additional Advantages | The device is user-friendly, adjustable for different therapy levels, and widely recognized in vision therapy practice. Its simple design makes it ideal for teaching patients how binocular vision and convergence work while tracking improvement during therapy. |
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