--- product_id: 38669120 title: "Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S..." brand: "brock string" price: "70.55 DT" currency: TND in_stock: null reviews_count: 13 category: "Brock String" url: https://www.desertcart.tn/products/38669120-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle store_origin: TN region: Tunisia --- # Precision eye muscle training Boosts athletic visual coordination Durable nylon string with quality beads Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... **Brand:** brock string **Price:** 70.55 DT **Availability:** ❌ Out of Stock ## Summary > 👁️‍🗨️ See the difference, own the advantage. ## Quick Answers - **What is this?** Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... by brock string - **How much does it cost?** 70.55 DT with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/38669120-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 - • **Athlete-Approved Visual Edge:** Train in sport-specific positions to elevate hand-eye coordination and reaction time. - • **Guided Training for Maximum Gains:** Includes clear instructions to optimize your vision exercises and track progress confidently. - • **Built to Last, Designed to Perform:** Premium nylon string and high-quality beads ensure consistent, long-term training reliability. - • **Effortless Setup, Instant Practice:** Simple to use at home or gym with a quick learning curve for all skill levels. - • **Sharpen Your Focus, Sharpen Your Game:** Enhance eye convergence and visual precision for daily tasks and competitive sports. ## Overview The Brock String is a professional-grade vision training tool designed to strengthen eye muscles, improve convergence, and boost focus. Ideal for athletes and vision therapy users, it features a durable 10-foot nylon string with 5 high-quality beads, enabling precise eye coordination exercises. Easy to set up and use, it comes with clear instructions to help users enhance visual performance and depth perception, making it a must-have for anyone serious about sharpening their sight and athletic edge. ## 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: 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 - 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 | B01MEFCDD1 | | Best Sellers Rank | #18,997 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #46 in Reflective Gear | | Brand | Brock String | | Brand Name | Brock String | | Color | White | | Customer Reviews | 4.5 4.5 out of 5 stars (2,107) | | Date First Available | October 15, 2016 | | Grip Material | Plastic | | Handle Material | Plastic | | Item Length | 120 Inches | | Item Package Dimensions L x W x H | 7.4 x 6.34 x 0.94 inches | | Item Weight | 0.02 Kilograms | | Manufacturer | Thera Systems LLC | | Material | Nylon | | Package Weight | 0.09 Kilograms | | Part Number | 7.22512E+11 | | Size | 10 Ft with 5 Beads | | Style | Pack of 1 | | Suggested Users | unisex-adult | | Target Audience | Adult | | UPC | 722512368781 860007923081 | ## Product Details - **Brand:** Brock String - **Color:** White - **Handle Material:** Plastic - **Material:** Nylon - **Target Audience:** Adult ## Images ![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S... - Image 1](https://m.media-amazon.com/images/I/615dTbVdzbL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Questions & Answers **Q: Will this improve bad case of myopia in adolescent?** A: This device improves depth perception, the ability of both eyes to focus at the same distance. Myopia is the inability to see beyond a given (near) distance. This may help improve myopia, but is not the intention. I use it to improve my focus n the front sight of my air rifle. **Q: Will this exercise help achieve fusion if the eyes are slightly turned inwards, rather than outwards?** A: If you believe the research, based on how it works, all eye muscles should be strengthened. I bough it to help me to hopefully correct my blurred Red Dot. It took about 8 weeks before I noticed a change. Good Luck. **Q: How long do you needto do this to get results?** A: I really don't know. I've been doing it for a few months--a regular, brief daily routine--along with remembering to be aware of seeing out of both eyes, rather than ignoring my lazy eye. Don't know how long it will take to get results -- but I think of the words of my meditation teacher when asked a similar question: "try it for a couple of years and see what you think . . ." Good luck and if it's not helping, check out the book, 'Fixing My Gaze'. There's some good information in there. **Q: Does this fix eye asymmetry?** A: Hi, This product is intended for convergence training where the eyes work together to perform convergence at each bead. ## 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 10 Foot Vision Convergence Training Tool - Train Vision, Improve Strength & 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.tn/products/38669120-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle](https://www.desertcart.tn/products/38669120-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-04-24*