Brock String 3-Bead Vision Trainer – Eye Convergence Tool

The Brock String Three-Bead Vision Trainer is a classic, optometrist-recommended tool used to develop binocular vision, improve eye coordination, and build convergence skills. Whether you're an athlete looking to sharpen visual focus, a parent supporting your child's eye development, or someone working on visual tracking exercises with a vision therapist, this compact string trainer delivers targeted, effective results.

Key Features

• Three Tricolor Beads: The distinctive red, yellow, and green beads are spaced along the string to guide progressive convergence and divergence exercises, helping train both eyes to work together smoothly.
• Stereoscopic Vision Development: Regular use supports the development of depth perception and three-dimensional visual awareness — essential for sports performance, reading, and daily tasks.
• Compact & Portable: Measuring just 9.5 cm × 6.5 cm × 2.5 cm (approx. 3.7" × 2.5" × 1.0"), this trainer is lightweight and easy to carry wherever you go.
• Durable Construction: Made from sturdy plastic and nylon for long-lasting use during daily practice sessions.
• 2 Color Options: Choose the style that suits you best.
• Suitable for All Ages: Ideal for children and adults alike who are working on visual coordination and focus exercises under professional guidance.

How It Works

The Brock String method involves attaching one end of the string to a fixed point and holding the other end at nose level. You then focus on each bead in sequence, training both eyes to converge accurately on a single point. This exercise strengthens eye teaming and visual focusing ability over time.

Product Specifications

• Material: Plastic + Nylon
• Dimensions: 9.5 cm / 3.7 in × 6.5 cm / 2.5 in × 2.5 cm / 1.0 in
• Number of Beads: 3 (tricolor)
• Color Options: 2 available
• Brand: Qme

Who Is It For?

This trainer is perfect for athletes, students, children working with a vision therapist, and anyone seeking to improve eye coordination and visual focus as part of a guided vision therapy program.

For more information on vision therapy and eye coordination exercises, visit the National Eye Institute at NIH, a trusted resource for eye health education.

Frequently Asked Questions

Q: What is a Brock String Three-Bead Vision Trainer used for?

A: The Brock String is a vision therapy tool used to develop and improve binocular vision, eye convergence, and depth perception. By focusing on each of the three colored beads in sequence, users train both eyes to work together more effectively — supporting visual coordination for sports, reading, and everyday activities.

Q: What is the Brock String Vision Trainer made of?

A: This trainer is constructed from durable plastic and nylon, making it lightweight yet resilient for regular daily use. It measures 9.5 cm × 6.5 cm × 2.5 cm (approx. 3.7" × 2.5" × 1.0").

Q: Is the Brock String trainer suitable for children?

A: Yes. The Brock String three-bead trainer is appropriate for both children and adults. It is often used under the guidance of a vision therapist or eye care professional to support the development of eye teaming, stereoscopic vision, and visual tracking skills.

Q: How often should I use the Brock String Vision Trainer?

A: Frequency of use should be guided by your eye care professional or vision therapist. Consistent, structured practice sessions are typically recommended for the best results in developing eye coordination and convergence.