---
product_id: 55273442
title: "Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S..."
brand: "brock string"
price: "Bs.256"
currency: BOB
in_stock: null
reviews_count: 13
category: "Brock String"
url: https://www.desertcart.bo/products/55273442-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle
store_origin: BO
region: Bolivia
---

# 3 x 6-ft strings for versatile training Durable nylon/polypropylene for long-lasting use 5 precision beads per string for targeted focus Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S...

**Brand:** brock string
**Price:** Bs.256
**Availability:** ❌ Out of Stock

## Summary

> 👁️‍🗨️ Sharpen your sight, own your 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?** Bs.256 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/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 durability through countless training sessions, keeping you game-ready.
- • **Effortless Home Use:** Simple setup and included instructions make vision training seamless and accessible.
- • **Precision Bead Control:** Five tightly-fitted beads per string enhance depth perception and focus accuracy.
- • **Triple-String Advantage:** Three 6-foot strings let you customize drills for sport-specific eye coordination.
- • **Elite Vision Conditioning:** Train eye muscles to conquer convergence insufficiency and boost athletic precision.

## Overview

The Brock String is a professional-grade vision training tool featuring three 6-foot durable strings with five precision beads each, designed to improve eye muscle strength, convergence, and depth perception. Ideal for athletes and vision therapy users, it offers easy home use with included instructions, helping enhance focus, hand-eye coordination, 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: Good quality and helpful. - It does exactly what it is supposed to do. It is of good quality and has been helpful.

## 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 | #14,851 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #4,519 in Shooting #5,158 in Hunting Equipment |
| Brand | Brock String |
| Brand Name | Brock String |
| Color | Blue, Green, Red |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,086) |
| Date First Available | August 31, 2017 |
| Grip Material | Nylon or Polypropylene |
| Handle Material | Nylon or Polypropylene |
| Item Length | 72 Inches |
| Item Package Dimensions L x W x H | 5.51 x 4.25 x 1.57 inches |
| Item Weight | 0.04 Kilograms |
| Manufacturer | Thera Systems LLC |
| Material | Nylon, Polypropylene (PP) |
| Package Weight | 0.04 Kilograms |
| Part Number | 5Q-N5NL-FZO4 |
| Recommended Uses For Product | Vision Training, Convergence Insufficiency, Strength and Athletic Performance, Sports Performance |
| Size | 6 Ft with 5 Beads |
| Special Feature | Convergence Training |
| Style | Pack of 3 |
| 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

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

## 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.

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ 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.

## 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!
- SADIKALO 6Pcs Eye Exercise Chart - Visual Muscle Relaxation Office Classroom Wall Decor Myopia Dry Eye Office Gifts Waterproof Posters Card Desk Sign for Home School Kids Students Office Coworkers
- Brock String - Vision Convergence Training - Convergence Insufficiency Tool - Train Vision, Athletic Performance, and More!, White, 6 foot

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.bo/products/55273442-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle](https://www.desertcart.bo/products/55273442-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle)

---

*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-01-23*