Brock String Deluxe Cordlock: Professional Vision Training Tool with Spring-Loaded Beads.

The Brock String Deluxe Cordlock is a 20ft/6m vision therapy instrument designed for convergence insufficiency treatment and binocular vision training. Unlike traditional Brock Strings, this model features 3 spring-loaded beads that remain securely in place during therapy—eliminating the frustration of bead drift caused by cord stretching or angled positioning.
Setup is simple: hold the blue stick end near the nose tip while anchoring the loop end to a fixed point like a doorknob. The ergonomic handle design reduces user fatigue and keeps focus on the exercise itself, not on managing the string.

Instructions are not included and should be obtained from your eye care provider. Ideal for clinical settings, vision therapy offices, and home-based vision training programs.

Single unit.