---
product_id: 30504313
title: "Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility"
brand: "brock string"
price: "£9.41"
currency: GBP
in_stock: true
reviews_count: 13
category: "Brock String"
url: https://www.desertcart.co.uk/products/30504313-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle
store_origin: GB
region: United Kingdom
---

# 3 durable high-quality beads 6 ft precision training string quick & easy setup Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility

**Brand:** brock string
**Price:** £9.41
**Availability:** ✅ In Stock

## Summary

> 👁️‍🗨️ See the difference, own the moment.

## Quick Answers

- **What is this?** Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility by brock string
- **How much does it cost?** £9.41 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/30504313-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle)

## Best For

- brock string enthusiasts

## Why This Product

- Trusted brock string brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Guided for Success:** Includes clear instructions so you maximize every minute of your vision training.
- • **Effortless Eye Training:** Simple setup and intuitive use make vision exercises accessible anytime, anywhere.
- • **Athlete-Approved Visual Edge:** Train in sport-specific positions to elevate your game with enhanced eye coordination.
- • **Sharper Focus, Stronger Vision:** Boost eye muscle strength and convergence for crystal-clear daily and sports vision.
- • **Built to Last, Built for Results:** Premium string and beads ensure consistent performance session after session.

## Overview

The Brock String Vision Convergence Insufficiency Training Tool is a 6-foot durable eye exercise device with 3 high-quality beads designed to strengthen eye muscles, improve focus, and enhance visual agility. Ideal for both beginners and athletes, it offers easy setup and comes with clear instructions to support effective vision training and boost daily and sports performance.

## Description

Take your vision and athletic performance to the next level with the Brock String, a versatile sight adjustment tool designed for hand eye coordination training, vision exercise, and depth perception training. Ideal for athletes, hobbyists, and anyone looking to improve visual skills, this tool strengthens eye muscles while enhancing focus and precision. By practicing with the Brock String, you can enhance eye tracking, alignment, and coordination, giving you a competitive edge in sports or daily activities that demand sharp vision. Setup is simple and intuitive, making this vision exercise tool suitable for both beginners and advanced users. The durable string and high-quality beads provide long-lasting performance, ensuring consistent results over repeated sessions. A clear, included instruction guide walks you through proper use and tips to maximize your training, so you can confidently practice at home or in the gym.

Review: Good quality, easy to use - It's good. The beads slide easily but stay where you put them. The string is easy to tie and untie. The string can be drawn taunt and bounce is easily controlled.
Review: Great for eye convergence - This string provides a means to work on convergence problems. I have excellent vision in my eyes but when I'm tired etc. I start seeing double --especially watching the television. I can see improvement after just a few sessions of the exercises. Hopefully before long I will no longer have the problem. Comes with instructions in English! They just don't indicate how long one should do them. If you get one, practice at least a few minutes at a time.

## Features

- ENHANCE CONVERGENCE AND FOCUS: Use the Brock String convergence training tool to strengthen eye muscles, focus, and support visual performance for daily activities and sports
- BOOST ATHLETIC PERFORMANCE: The Brock eye string allows precise eye training in sport-specific positions, giving you a competitive edge and enhanced visual coordination
- EASY-TO-USE EYE EXERCISE TOOL: Simple setup and short learning curve let you practice convergence and eye focus exercises at home, making vision training convenient for beginners and advanced users
- PREMIUM FOCUS STRING WITH BALLS: Crafted with durable string and high-quality beads, this eye muscle strengthening tool ensures long-lasting use and consistent performance for repeated vision exercises
- FRONT SIGHT TOOL WITH INSTRUCTIONS INCLUDED: Comes with clear guidance and tips for proper use, ensuring effective training and helping you get the most from your Brock String sessions

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01AZYTTPC |
| Brand Name | Brock String |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,113) |
| Date First Available | January 23, 2016 |
| Item Package Dimensions L x W x H | 4.13 x 3.86 x 0.59 inches |
| Manufacturer | Thera Systems LLC |
| Package Weight | 0.02 Kilograms |
| Part Number | NX-TI65-VMCX |
| Size | 6 Ft with 3 Beads |
| Style | Pack of 1 |

## Images

![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 1](https://m.media-amazon.com/images/I/71aLri4CfSL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good quality, easy to use
*by J***B on December 2, 2025*

It's good. The beads slide easily but stay where you put them. The string is easy to tie and untie. The string can be drawn taunt and bounce is easily controlled.

### ⭐⭐⭐⭐⭐ Great for eye convergence
*by C***D on January 7, 2026*

This string provides a means to work on convergence problems. I have excellent vision in my eyes but when I'm tired etc. I start seeing double --especially watching the television. I can see improvement after just a few sessions of the exercises. Hopefully before long I will no longer have the problem. Comes with instructions in English! They just don't indicate how long one should do them. If you get one, practice at least a few minutes at a time.

### ⭐⭐⭐⭐⭐ Good quality and helpful.
*by A***R on November 17, 2025*

It does exactly what it is supposed to do. It is of good quality and has been helpful.

## Frequently Bought Together

- Brock String 6 Foot with 3 Beads - Vision Convergence Training - Convergence Insufficiency Tool - Train Vision, Athletic Performance, and More!
- 2 Strabismus Correction Cards, Improve Visual Sense Amblyopia Coated Paper Training Cards with Red and Green Bars
- Brock String - Vision Convergence Training - Convergence Insufficiency Tool - Train Vision, Athletic Performance, and More!, White, 6 foot

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-20*