---
product_id: 38669120
title: "Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S..."
brand: "brock string"
price: "€ 16.70"
currency: EUR
in_stock: true
reviews_count: 13
category: "Brock String"
url: https://www.desertcart.be/products/38669120-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle
store_origin: BE
region: Belgium
---

# Precision eye muscle training Boosts athletic visual coordination Durable nylon string with quality beads Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S...

**Brand:** brock string
**Price:** € 16.70
**Availability:** ✅ In Stock

## Summary

> 👁️‍🗨️ See the difference, own the advantage.

## Quick Answers

- **What is this?** Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... by brock string
- **How much does it cost?** € 16.70 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/38669120-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

- • **Athlete-Approved Visual Edge:** Train in sport-specific positions to elevate hand-eye coordination and reaction time.
- • **Guided Training for Maximum Gains:** Includes clear instructions to optimize your vision exercises and track progress confidently.
- • **Built to Last, Designed to Perform:** Premium nylon string and high-quality beads ensure consistent, long-term training reliability.
- • **Effortless Setup, Instant Practice:** Simple to use at home or gym with a quick learning curve for all skill levels.
- • **Sharpen Your Focus, Sharpen Your Game:** Enhance eye convergence and visual precision for daily tasks and competitive sports.

## Overview

The Brock String is a professional-grade vision training tool designed to strengthen eye muscles, improve convergence, and boost focus. Ideal for athletes and vision therapy users, it features a durable 10-foot nylon string with 5 high-quality beads, enabling precise eye coordination exercises. Easy to set up and use, it comes with clear instructions to help users enhance visual performance and depth perception, making it a must-have for anyone serious about sharpening their sight and athletic edge.

## Description

Product description

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 | B01MEFCDD1 |
| Best Sellers Rank | #20,985 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #49 in Reflective Gear |
| Brand | Brock String |
| Brand Name | Brock String |
| Color | White |
| Customer Reviews | 4.5 out of 5 stars 2,122 Reviews |
| Grip Material | Plastic |
| Handle Material | Plastic |
| Item Length | 120 Inches |
| Item Weight | 0.02 Kilograms |
| Manufacturer | Thera Systems LLC |
| Material | Nylon |
| Model Number | 7.22512E+11 |
| Part Number | 7.22512E+11 |
| Target Audience | Adult |
| UPC | 722512368781 860007923081 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Brock String
- **Color:** White
- **Handle Material:** Plastic
- **Material:** Nylon
- **Target Audience:** Adult

## Images

![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 1](https://m.media-amazon.com/images/I/615dTbVdzbL.jpg)
![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 2](https://m.media-amazon.com/images/I/619gq0eFnDL.jpg)
![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 3](https://m.media-amazon.com/images/I/61BKsBy53-L.jpg)

## Available Options

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

## Questions & Answers

**Q: Will this improve bad case of myopia in adolescent?**
A: This device improves depth perception, the ability of both eyes to focus at the same distance.  Myopia is the inability to see beyond a given (near) distance.  This may help improve myopia, but is not the intention.  I use it to improve my focus n the front sight of my air rifle.

**Q: Will this exercise help achieve fusion if the eyes are slightly turned inwards, rather than outwards?**
A: If you believe the research, based on how it works, all eye muscles should be strengthened.  I bough it to help me to hopefully correct my blurred Red Dot.  It took about 8 weeks before I noticed a change.  Good Luck.

**Q: How long do you needto do this to get results?**
A: I really don't know. I've been doing it for a few months--a regular, brief daily routine--along with remembering to be aware of seeing out of both eyes, rather than ignoring my lazy eye. Don't know how long it will take to get results -- but I think of the words of my meditation teacher when asked a similar question: "try it for a couple of years and see what you think . . ." Good luck and if it's not helping, check out the book, 'Fixing My Gaze'. There's some good information in there.

**Q: Does this fix eye asymmetry?**
A: Hi,

This product is intended for convergence training where the eyes work together to perform convergence at each bead.

## 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.

### ⭐⭐⭐⭐⭐ Great quality, great product
*by J***C on February 6, 2019*

I read a lot of reviews that mentioned the beads being loose on the string, but I did not find that to be the case. The string is good quality and the beads fit well and stay in place, yet are easy to position. The item comes with directions and I received an email from the seller with a pdf of the same sheet, which I appreciated. My only issue is that my eyes freakin suck! I have a prism of 21 in my glasses, an extreme case of diplopia. I don't have "googly eyes (what my wife teases me about), but they just don't like working together as they tend to act esotropic. I am somewhat discouraged that I simply cannot see a single image of a bead if it is positioned more than 5 inches from my face. The directions provided do not provide any guidance for this issue but I was able to find some tips on other internet sources. If anyone else has the same issue, use an index card to cover your dominant eye and focus hard on the bead with the other eye. Slowly remove the index card and it can help bring the two images of the bead closer together. Alternatively, simply closing your eyes for a second can bring them close as well. I realize this item isn't necessarily sold to treat a medical condition, but perhaps the seller can add these tips in for sports use? All in all, fantastic product and great customer support!

## Frequently Bought Together

- Brock String 10 Foot Vision Convergence Training Tool - Train Vision, Improve Strength & 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 Belgium*
*Store origin: BE*
*Last updated: 2026-05-27*