--- product_id: 30504313 title: "Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S..." price: "€ 17.79" currency: EUR in_stock: true reviews_count: 13 url: https://www.desertcart.at/products/30504313-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle store_origin: AT region: Austria --- # quick, easy setup & use 6 ft precision training string durable, high-quality beads Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... **Price:** € 17.79 **Availability:** ✅ In Stock ## Summary > 👁️‍🗨️ See the difference, own the moment. ## Quick Answers - **What is this?** Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - **How much does it cost?** € 17.79 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/30504313-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Train Anywhere, Anytime:** Compact 6 ft string with simple setup—perfect for busy professionals on the go. - • **Gain the Competitive Edge:** Enhance visual coordination and agility to outperform in sports and fast-paced environments. - • **Sharpen Your Focus Like a Pro:** Boost eye muscle strength and convergence for razor-sharp daily and sports vision. - • **Built to Last, Built for Results:** Premium durable string and beads ensure consistent performance session after session. - • **Guided Training for Maximum Impact:** Includes clear instructions so you can start improving your eye focus immediately. ## Overview The Brock String is a 6-foot eye convergence training tool featuring three durable beads designed to strengthen eye muscles, improve focus, and enhance visual agility. Ideal for both beginners and advanced users, it offers a quick setup and comes with clear instructions, making it a must-have for professionals and athletes seeking to boost their visual performance and gain a competitive edge. ## Description Buy Brock String, Vision Convergence Training Tool, 6 Ft with 3 Beads, White | For Insufficiency, Eye Muscle Strengthening, Focus Exercise and Agility: Eye Protection Accessories - 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 | B01AZYTTPC | | Best Sellers Rank | #4,393 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #115 in Archery Bow Maintenance Accessories | | Brand Name | Brock String | | Customer Reviews | 4.5 4.5 out of 5 stars (2,192) | | Date First Available | January 23, 2016 | | Item Package Dimensions L x W x H | 4.13 x 3.86 x 0.59 inches | | Manufacturer | Thera Systems LLC | | Package Weight | 0.02 kg | | Part Number | NX-TI65-VMCX | | Size | 6 Ft with 3 Beads | | Style | Pack of 1 | ## Images ![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 1](https://m.media-amazon.com/images/I/71aLri4CfSL.jpg) ![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 2](https://m.media-amazon.com/images/I/81FsNMYSZ0L.jpg) ![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 3](https://m.media-amazon.com/images/I/71pwb4Th5CL.jpg) ![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 4](https://m.media-amazon.com/images/I/81RLMyqzXzL.jpg) ![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 5](https://m.media-amazon.com/images/I/618vW51RhpL.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. ### ⭐⭐⭐⭐⭐ Útil *by A***A on September 8, 2026* Muy útil! ## Frequently Bought Together - Brock String 6 Foot with 3 Beads - Vision Convergence Training - Convergence Insufficiency Tool - Train Vision, Athletic Performance, and More! - 2 Strabismus Correction Cards, Improve Visual Sense Amblyopia Coated Paper Training Cards with Red and Green Bars - 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.at/products/30504313-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle](https://www.desertcart.at/products/30504313-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-10-04*