---
product_id: 55273442
title: "Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S..."
brand: "brock string"
price: "262 kr"
currency: NOK
in_stock: true
reviews_count: 13
category: "Brock String"
url: https://www.desertcart.no/products/55273442-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle
store_origin: NO
region: Norway
---

# 72-inch precision training string 5 high-visibility beads for focus drills Durable nylon/polypropylene build Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S...

**Brand:** brock string
**Price:** 262 kr
**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 S... by brock string
- **How much does it cost?** 262 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.no](https://www.desertcart.no/products/55273442-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

- • **Built to Last:** Premium materials ensure consistent, long-term use through countless training sessions.
- • **Effortless Setup & Use:** Simple, beginner-friendly design lets you start vision training at home with minimal learning curve.
- • **Guided Training Included:** Clear instructions help you maximize every session and track your progress with confidence.
- • **Sharpen Your Visual Edge:** Boost eye muscle strength and convergence for razor-sharp focus in daily life and sports.
- • **Athlete-Approved Performance:** Train in sport-specific positions to elevate your visual coordination and gain a competitive advantage.

## Overview

The Brock String is a 72-inch durable nylon and polypropylene eye training tool featuring 5 high-visibility beads designed to improve convergence insufficiency, eye muscle strength, and focus. Ideal for athletes and professionals, it offers easy setup, guided instructions, and long-lasting performance to enhance visual agility and coordination.

## Description

Buy Brock String, Vision Convergence Training Tool, 6Ft with 5 Beads, Pack of 3 | 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: Good quality and helpful. - It does exactly what it is supposed to do. It is of good quality and has been helpful.

## 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 | B075881G1K |
| Best Sellers Rank | #4,956 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3,454 in Shooting #4,243 in Hunting Equipment |
| Brand | Brock String |
| Brand Name | Brock String |
| Color | Blue, Green, Red |
| Customer Reviews | 4.5 out of 5 stars 2,197 Reviews |
| Grip Material | Nylon or Polypropylene |
| Handle Material | Nylon or Polypropylene |
| Item Highlight | For Insufficiency, Eye Muscle Strengthening, Focus Exercise and Agility |
| Item Length | 72 inches |
| Item Weight | 0.04 kg |
| Manufacturer | Thera Systems LLC |
| Material | Nylon, Polypropylene (PP) |
| Model Number | 5Q-N5NL-FZO4 |
| Number of Items | 3 |
| Other Special Features of the Product | Convergence Training |
| Part Number | 5Q-N5NL-FZO4 |
| Recommended Uses For Product | Vision Training, Convergence Insufficiency, Strength and Athletic Performance, Sports Performance |
| Special Feature | Convergence Training |
| Target Audience | Adult |
| UPC | 860007923098 722512369382 |
| Unit Count | 3 Count |

## Product Details

- **Brand:** Brock String
- **Material:** Nylon, Polypropylene (PP)
- **Recommended Uses For Product:** Vision Training, Convergence Insufficiency, Strength and Athletic Performance, Sports Performance
- **Special Feature:** Convergence Training
- **Target Audience:** Adult

## Images

![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 1](https://m.media-amazon.com/images/I/51i-qwxd9HL.jpg)
![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 2](https://m.media-amazon.com/images/I/61sBJaJtdXL.jpg)
![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 3](https://m.media-amazon.com/images/I/51dsMZYiYtL.jpg)
![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 4](https://m.media-amazon.com/images/I/61diUmT6sBL.jpg)
![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 5](https://m.media-amazon.com/images/I/61dDl7K1JEL.jpg)

## Available Options

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

## 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.

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ 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

## Frequently Bought Together

- Brock String Front Sight Focus String Combo Pack, Three 6-Foot, Vision Convergence Training Tool, Great for Shooters, Front Sight Training and More!
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- 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 Norway*
*Store origin: NO*
*Last updated: 2026-09-16*