---
product_id: 24534652
title: "Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility"
brand: "brock string"
price: "€ 17.46"
currency: EUR
in_stock: true
reviews_count: 13
category: "Brock String"
url: https://www.desertcart.at/products/24534652-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle
store_origin: AT
region: Austria
---

# 5 high-visibility beads for targeted focus 6 ft precision training length Durable nylon & EVA grip for lasting use Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility

**Brand:** brock string
**Price:** € 17.46
**Availability:** ✅ In Stock

## Summary

> 👁️‍🗨️ See the difference, own the game.

## 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?** € 17.46 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/24534652-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-Grade Visual Edge:** Train your eyes in sport-specific positions to elevate coordination and outpace the competition.
- • **Sharper Focus, Stronger Vision:** Boost your eye muscle strength and conquer convergence insufficiency with targeted exercises.
- • **Effortless Setup, Instant Practice:** Simple to use at home with a quick learning curve—vision training made convenient for busy pros.
- • **Guided Training for Maximum Impact:** Includes clear instructions so you can optimize every session and track your progress confidently.
- • **Premium Build for Consistent Results:** Crafted with durable materials and high-quality beads to ensure reliable, repeatable workouts.

## Overview

The Brock String Vision Convergence Training Tool is a 6-foot durable eye exercise device featuring 5 high-visibility beads and an EVA foam grip. Designed to strengthen eye muscles, improve focus, and enhance visual coordination, it’s perfect for athletes and professionals seeking to boost daily visual performance. Easy to use at home with included instructions, this tool supports effective convergence training and agility enhancement.

## Description

Buy Brock String, Vision Convergence Training Tool, 6 Ft with 5 Beads, White | For Insufficiency, Eye Muscle Strengthening, Focus Exercise and Agility: Everything Else - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

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.
Review: It’s just as the description From the selling spot. - The product was just like the description. I felt the paper on how to use this product. Was a little difficult to understand for me.0

## 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 | B0190LOMCQ |
| Best Sellers Rank | #2,405 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3,527 in Exercise & Fitness Equipment |
| Brand | Brock String |
| Brand Name | Brock String |
| Color | White |
| Customer Reviews | 4.5 out of 5 stars 2,180 Reviews |
| Grip Material | Ethylene Vinyl Acetate Foam |
| Handle Diameter | 38 month |
| Handle Material | Ethylene Vinyl Acetate (EVA) |
| Item Length | 6 feet |
| Item Weight | 0.02 kg |
| Manufacturer | Thera Systems LLC |
| Material | Nylon, Polypropylene (PP) |
| Model Number | 9G-WVV7-SZRG |
| Number of Packs | 1 |
| Other Special Features of the Product | Durable |
| Part Number | 9G-WVV7-SZRG |
| Recommended Uses For Product | Exercise and Fitness |
| Special Feature | Durable |
| Target Audience | Adult |
| UPC | 860007923074 722512440333 |
| Unit Count | 1 count |

## Product Details

- **Brand:** Brock String
- **Material:** Nylon, Polypropylene (PP)
- **Recommended Uses For Product:** Exercise and Fitness
- **Special Feature:** Durable
- **Target Audience:** Adult

## 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/513qIyNgBPL.jpg)

## Available Options

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

## Questions & Answers

**Q: Does it come with instructions?**
A: Yes it comes with instructions both with the product and again digitally by email.

**Q: does it improve my reaction time ?**
A: We used these for my daughter to help her eyes work together. It was suggested by her vision therapist. I played around with it also and you do get better at focusing.

**Q: Are the balls removable?**
A: You could fairly easily remove them by untying the knot at the end of the string. However it may be tricky to put them back on.

**Q: Can this be used in the bedroom?**
A: Hi, Brock String is a vision performance training tool that can be used anywhere.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ It’s just as the description From the selling spot.
*by L***A on July 30, 2026*

The product was just like the description. I felt the paper on how to use this product. Was a little difficult to understand for me.0

### ⭐⭐⭐⭐⭐ These beads work at home the same as at therapy!
*by A***R on September 18, 2025*

I was able to use this to strengthen my eye convergence at home as well as I could using the beads at therapy.

## Frequently Bought Together

- 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 Austria*
*Store origin: AT*
*Last updated: 2026-08-16*