Sell [KaKa Toys] String Vision Convergence Training Tool Shooters Front Sight Training Tool best price

Description: 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 Material: Nylon Bead Quantity: 3pcs Line Length: Approx. 269cm/105.9 inch Box Size: Approx.117 x 87mm/4.6 x 3.4 inch Package Includes: 1 Piece Vision Convergence Training Tool Note: Size for manual measurement, there may be a 0 to 1 cm error, belongs to the normal phenomenon. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!