Features: Helps improve convergence insufficiency, as well as strength sight focusing. Effectively promote convergence to corrects nearsightedness and strabismus. Can be used at home, very easy to operate. Can be used for convergence insufficiency training, sports vision training and front sight focusing training. Made of quality beads and line, durable and convenient to use. Specification: Item Type: Vision Convergence Training Tool Color: As Pictures Show Material: Plastic Bead Quantity: 3pcs Line Length: Approx. 223cm / 7.3ft Package List: 1 * Vision Convergence Training Tool