--- product_id: 24534652 title: "Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility" brand: "brock string" price: "$31.25" currency: USD in_stock: true reviews_count: 13 category: "Brock String" url: https://www.desertcart.ec/products/24534652-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle store_origin: EC region: Ecuador --- # 6 ft precision training length Durable nylon & polypropylene string Strengthens eye muscles & focus Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility **Brand:** brock string **Price:** $31.25 **Availability:** βœ… In Stock ## Summary > πŸ‘οΈβ€πŸ—¨οΈ See the difference, own the game. ## Quick Answers - **What is this?** Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility by brock string - **How much does it cost?** $31.25 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/24534652-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 - β€’ **Sharper Vision, Sharper Edge:** Boost your eye muscle strength and convergence for unbeatable focus in sports and daily life. - β€’ **Pro-Level Visual Coordination:** Enhance hand-eye coordination and depth perception to outplay the competition. - β€’ **Effortless Setup, Instant Gains:** Simple to use with a short learning curveβ€”start training your eyes anytime, anywhere. - β€’ **Built to Last, Built for Results:** Premium durable string and high-quality beads ensure consistent performance session after session. - β€’ **Guided Training for Maximum Impact:** Includes clear instructions so you train smarter, not harder, and see real improvements fast. ## Overview The Brock String is a 6-foot durable eye training tool designed to strengthen eye muscles, improve convergence, and enhance focus. Crafted with high-quality nylon string and beads, it supports vision exercises for athletes and professionals seeking better hand-eye coordination and depth perception. Easy to set up and use, it comes with clear instructions to maximize training effectiveness at home or on the go. ## Description Product description 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 | B0190LOMCQ | | Brand | Brock String | | Brand Name | Brock String | | Color | White | | Customer Reviews | 4.5 out of 5 stars 2,124 Reviews | | Grip Material | Ethylene Vinyl Acetate Foam | | Handle Diameter | 38 month | | Handle Material | Ethylene Vinyl Acetate (EVA) | | Item Length | 6 Feet | | Item Weight | 0.02 Kilograms | | Manufacturer | Thera Systems LLC | | Material | Nylon, Polypropylene (PP) | | Model Number | 9G-WVV7-SZRG | | Other Special Features of the Product | Durable | | Part Number | 9G-WVV7-SZRG | | Recommended Uses For Product | Exercise and Fitness | | Special Feature | Durable | | Target Audience | Adult | | UPC | 860007923074 722512440333 | | Unit Count | 1.00 Count | ## Product Details - **Brand:** Brock String - **Material:** Nylon, Polypropylene (PP) - **Recommended Uses For Product:** Exercise and Fitness - **Special Feature:** Durable - **Target Audience:** Adult ## Images ![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 1](https://m.media-amazon.com/images/I/513qIyNgBPL.jpg) ![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 2](https://m.media-amazon.com/images/I/615dTbVdzbL.jpg) ![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 3](https://m.media-amazon.com/images/I/51od-gk8pjL.jpg) ![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 4](https://m.media-amazon.com/images/I/61lJnrLSL-L.jpg) ![Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 5](https://m.media-amazon.com/images/I/61BKsBy53-L.jpg) ## Available Options This product comes in different **Size, Style** options. ## 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 ### ⭐⭐⭐⭐⭐ 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 - 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? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ec/products/24534652-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle](https://www.desertcart.ec/products/24534652-brock-string-vision-convergence-insufficiency-training-tool-for-eye-muscle) --- *Product available on Desertcart Ecuador* *Store origin: EC* *Last updated: 2026-05-14*