--- product_id: 30504313 title: "Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility" brand: "brock string" price: "64.83 DT" currency: TND in_stock: true reviews_count: 13 category: "Brock String" url: https://www.desertcart.tn/products/30504313-vision-convergence-insufficiency-training-tool-for-eye-muscle-strengthening-focus store_origin: TN region: Tunisia --- # 6 ft precision training length durable, taut plastic string 3 adjustable high-quality beads Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility **Brand:** brock string **Price:** 64.83 DT **Availability:** ✅ In Stock ## Summary > 👁️‍🗨️ See the difference, own the game! ## Quick Answers - **What is this?** Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility by brock string - **How much does it cost?** 64.83 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/30504313-vision-convergence-insufficiency-training-tool-for-eye-muscle-strengthening-focus) ## 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 - • **Effortless Setup & Use:** Quick to assemble and beginner-friendly for consistent home vision workouts. - • **Guided Training Included:** Clear instructions and expert tips maximize your vision improvement journey. - • **Sport-Specific Visual Edge:** Train your eyes in real-game positions to elevate coordination and reaction time. - • **Sharper Focus, Stronger Vision:** Boost eye muscle strength and convergence for daily clarity and peak sports performance. - • **Premium Build for Lasting Results:** High-quality beads stay put on a resilient string, ensuring reliable, repeatable training. ## Overview The Brock String Vision Convergence Training Tool is a 6-foot durable eye exercise device featuring 3 adjustable beads designed to strengthen eye muscles, improve focus, and enhance visual agility. Ideal for athletes and vision therapy users alike, it offers easy setup, premium materials, and clear instructions to support effective daily training and boost both everyday and sports-related visual performance. ## Description Buy Brock String, Vision Convergence Training Tool, 6 Ft with 3 Beads, White | For Insufficiency, Eye Muscle Strengthening, Focus Exercise and Agility: Everything Else - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Good quality, balls don't slide easily and string stays taut - This Brock string is much better quality than I expected. It's not medical grade, but the balls don't easily slide around when you're using it; they stay in place. But they are also easily adjustable for multiple exercises. The string is kind of a plastic string material, so it can stay pretty taut, which is necessary for the eye exercises it's used for. It's easy to tie and untie. I just tie it to a cabinet handle, and it works great! Review: Great quality, great product - I read a lot of reviews that mentioned the beads being loose on the string, but I did not find that to be the case. The string is good quality and the beads fit well and stay in place, yet are easy to position. The item comes with directions and I received an email from the seller with a pdf of the same sheet, which I appreciated. My only issue is that my eyes freakin suck! I have a prism of 21 in my glasses, an extreme case of diplopia. I don't have "googly eyes (what my wife teases me about), but they just don't like working together as they tend to act esotropic. I am somewhat discouraged that I simply cannot see a single image of a bead if it is positioned more than 5 inches from my face. The directions provided do not provide any guidance for this issue but I was able to find some tips on other internet sources. If anyone else has the same issue, use an index card to cover your dominant eye and focus hard on the bead with the other eye. Slowly remove the index card and it can help bring the two images of the bead closer together. Alternatively, simply closing your eyes for a second can bring them close as well. I realize this item isn't necessarily sold to treat a medical condition, but perhaps the seller can add these tips in for sports use? All in all, fantastic product and great customer support! ## 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 | | Brand Name | Brock String | | Customer Reviews | 4.5 4.5 out of 5 stars (2,113) | | 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 Kilograms | | Part Number | NX-TI65-VMCX | | Size | 6 Ft with 3 Beads | | Style | Pack of 1 | ## Images ![Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 1](https://m.media-amazon.com/images/I/71aLri4CfSL.jpg) ![Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 2](https://m.media-amazon.com/images/I/81FsNMYSZ0L.jpg) ![Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 3](https://m.media-amazon.com/images/I/71pwb4Th5CL.jpg) ![Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 4](https://m.media-amazon.com/images/I/81RLMyqzXzL.jpg) ![Vision Convergence Insufficiency Training Tool for Eye Muscle Strengthening, Focus Exercise and Agility - Image 5](https://m.media-amazon.com/images/I/618vW51RhpL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good quality, balls don't slide easily and string stays taut *by J***E on September 9, 2024* This Brock string is much better quality than I expected. It's not medical grade, but the balls don't easily slide around when you're using it; they stay in place. But they are also easily adjustable for multiple exercises. The string is kind of a plastic string material, so it can stay pretty taut, which is necessary for the eye exercises it's used for. It's easy to tie and untie. I just tie it to a cabinet handle, and it works great! ### ⭐⭐⭐⭐⭐ Great quality, great product *by J***C on February 6, 2019* I read a lot of reviews that mentioned the beads being loose on the string, but I did not find that to be the case. The string is good quality and the beads fit well and stay in place, yet are easy to position. The item comes with directions and I received an email from the seller with a pdf of the same sheet, which I appreciated. My only issue is that my eyes freakin suck! I have a prism of 21 in my glasses, an extreme case of diplopia. I don't have "googly eyes (what my wife teases me about), but they just don't like working together as they tend to act esotropic. I am somewhat discouraged that I simply cannot see a single image of a bead if it is positioned more than 5 inches from my face. The directions provided do not provide any guidance for this issue but I was able to find some tips on other internet sources. If anyone else has the same issue, use an index card to cover your dominant eye and focus hard on the bead with the other eye. Slowly remove the index card and it can help bring the two images of the bead closer together. Alternatively, simply closing your eyes for a second can bring them close as well. I realize this item isn't necessarily sold to treat a medical condition, but perhaps the seller can add these tips in for sports use? All in all, fantastic product and great customer support! ### ⭐⭐⭐⭐⭐ great *by S***N on May 23, 2026* Easy to use and a great tool to work on neurocognitive training ## 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.tn/products/30504313-vision-convergence-insufficiency-training-tool-for-eye-muscle-strengthening-focus](https://www.desertcart.tn/products/30504313-vision-convergence-insufficiency-training-tool-for-eye-muscle-strengthening-focus) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-08-02*