---
product_id: 55273442
title: "- Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility"
brand: "brock string"
price: "701998₫"
currency: VND
in_stock: true
reviews_count: 8
category: "Brock String"
url: https://www.desertcart.vn/products/55273442-vision-convergence-insufficiency-training-tool-for-eye-muscle-strengthening-focus
store_origin: VN
region: Vietnam
---

# 3 x 6-ft precision strings Durable nylon/polypropylene build 5 adjustable beads per string - Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility

**Brand:** brock string
**Price:** 701998₫
**Availability:** ✅ In Stock

## Summary

> 👁️‍🗨️ Sharpen your vision, dominate your game!

## Quick Answers

- **What is this?** - Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility by brock string
- **How much does it cost?** 701998₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/55273442-vision-convergence-insufficiency-training-tool-for-eye-muscle-strengthening-focus)

## 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

- • **Premium Durability:** Crafted from high-quality nylon and polypropylene for long-lasting, reliable performance.
- • **Effortless Home Use:** Quick setup and intuitive design mean you can train anytime, anywhere—no coach needed.
- • **Proven Vision Improvement:** Join thousands who’ve enhanced eye strength and reduced double vision with guided exercises.
- • **Elite Eye Muscle Conditioning:** Train convergence insufficiency and sharpen focus with pro-grade Brock Strings.
- • **Sport-Specific Precision Training:** Optimize your athletic edge by simulating real-game eye positions effortlessly.

## Overview

The Vision Convergence Insufficiency Training Tool features three 6-foot Brock Strings, each with five tightly fitted beads, designed to strengthen eye muscles and improve focus. Made from durable nylon and polypropylene, this tool is ideal for athletes and professionals seeking enhanced visual performance and convergence training from the comfort of home. Backed by over 2,000 positive reviews, it’s a trusted solution for vision training and sports-specific eye agility.

## Description

Buy Brock String Front Sight Focus String Combo Pack, Three 6-Foot, Vision Convergence Training Tool, Great for Shooters, Front Sight Training and More!: Everything Else - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

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

- Convergence & Performance: Convergence training using a Brock String can be useful for convergence insufficiency, as well as strength and athletic performance.
- Sports Performance: With three 6-foot long strings and 5 tight-fitted beads on each, these Brock Strings are great for training the eyes in sport-specific positions – giving you the ultimate athletic edge.
- Easy To Use: You can use Brock String right from the comfort of your home with a very short learning curve involved.
- High Quality: These Brock Strings are designed with an extremely high quality, and highly durable string and beads.
- Instructions Included

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B075881G1K |
| Best Sellers Rank | #12,660 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #5,273 in Shooting #5,994 in Hunting Equipment |
| Brand | Brock String |
| Brand Name | Brock String |
| Color | Blue, Green, Red |
| Customer Reviews | 4.5 out of 5 stars 2,088 Reviews |
| Grip Material | Nylon or Polypropylene |
| Handle Material | Nylon or Polypropylene |
| Item Length | 72 Inches |
| Item Weight | 0.04 Kilograms |
| Manufacturer | Thera Systems LLC |
| Material | Nylon, Polypropylene (PP) |
| Other Special Features of the Product | Convergence Training |
| Recommended Uses For Product | Vision Training, Convergence Insufficiency, Strength and Athletic Performance, Sports Performance |
| Special Feature | Convergence Training |
| Target Audience | Adult |
| UPC | 860007923098 722512369382 |

## 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

![- Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 1](https://m.media-amazon.com/images/I/51i-qwxd9HL.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 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 Vietnam*
*Store origin: VN*
*Last updated: 2026-03-02*