---
product_id: 50773397
title: "Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S..."
brand: "brock string"
price: "1295858₫"
currency: VND
in_stock: null
reviews_count: 5
category: "Brock String"
url: https://www.desertcart.vn/products/50773397-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle
store_origin: VN
region: Vietnam
---

# Precision beads that stay put Durable, high-quality materials 6-foot length for versatile training Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S...

**Brand:** brock string
**Price:** 1295858₫
**Availability:** ❌ Out of Stock

## Summary

> 👁️‍🗨️ Sharpen your vision, elevate 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?** 1295858₫ with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/50773397-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:** Crafted from premium durable materials ensuring long-term performance and reliability.
- • **Train Like a Pro:** Enhance eye muscle strength and convergence for sharper focus and athletic edge.
- • **Precision Control:** Tight-fitted beads slide smoothly but stay exactly where you place them for targeted training.
- • **Effortless Home Use:** Simple setup with a short learning curve—train your vision anytime, anywhere.
- • **Boost Sports Performance:** Optimize eye coordination in sport-specific positions to gain a competitive advantage.

## Overview

The Brock String is a 6-foot vision training tool designed to improve convergence insufficiency and eye muscle strength. Featuring high-quality, durable string and precision beads that stay in place, it offers an easy-to-use, effective way to enhance visual focus and athletic performance from the comfort of home.

## Description

Shop Brock String - Vision Convergence Training Tool - Train Vision, Improve Strength & Athletic Performance, and More!. Free delivery and returns on all eligible orders.

Review: It arrived in a good condition, both the bead and the string are of good quality. The bead also doesn't shift easily so it is great!
Review: 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.

## Features

- Improves convergence & performance: Convergence training using a Brock string can be useful for convergence insufficiency, as well as strength and athletic performance.
- Sports Performance: With a 6-foot long string and tight-fitted Brock beads, this string is 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: This Brock string is designed with an extremely high quality, and highly durable string and beads.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0190LOMCQ |
| Batteries included? | No |
| Best Sellers Rank | 36,057 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 6 in Bowstrings |
| Brand | Brock String |
| Color | White |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,071) |
| Date First Available | 7 Aug. 2016 |
| Features | Durable |
| Is discontinued by manufacturer | No |
| Item model number | 9G-WVV7-SZRG |
| Manufacturer | Brock String |
| Material type | Plastic Rubber Metal |
| Package Dimensions | 11.9 x 9 x 2.7 cm; 18 g |
| Size | 6 foot |

## Product Details

- **Brand:** Brock String
- **Material:** Plastic Rubber Metal
- **Recommended uses for product:** Exercise and Fitness
- **Special feature:** Durable
- **Target audience:** Adult

## Images

![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 1](https://m.media-amazon.com/images/I/513qIyNgBPL.jpg)
![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 2](https://m.media-amazon.com/images/I/615dTbVdzbL.jpg)
![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 3](https://m.media-amazon.com/images/I/51od-gk8pjL.jpg)
![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 4](https://m.media-amazon.com/images/I/61lJnrLSL-L.jpg)
![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 5](https://m.media-amazon.com/images/I/61BKsBy53-L.jpg)

## 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

### ⭐⭐⭐⭐⭐ Review
*by S***H on 8 February 2020*

It arrived in a good condition, both the bead and the string are of good quality. The bead also doesn't shift easily so it is great!

### ⭐⭐⭐⭐⭐ Review
*by J***B on 2 December 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.

### ⭐⭐⭐⭐⭐ Review
*by G***A on 21 June 2019*

Prodotto come promesso. Ottimo.

## Frequently Bought Together

- Brock String - Vision Convergence Training - Convergence Insufficiency Tool - Train Vision, Athletic Performance, and More!, White, 6 foot
- Brock String 10 Foot Vision Convergence Training Tool - Train Vision, Improve Strength & Athletic Performance, and More!
- DEFINEST Rechargeable LED Laser Headlamp with an Adjustable Waist Belt, for Sensorimotor Control Testing and Physical Therapy

---

## 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.vn/products/50773397-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle](https://www.desertcart.vn/products/50773397-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle)

---

*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-03-18*