ITEM NAME:18mm Diameter Brock String Vision Convergence Insufficiency Training Tool J!j Description: Brock String - used in fixing convergence insufficiency and sports training. The basic purpose of the Brock String is to develop good binocular functions; in other words to get both eyes working together well. This activity teaches convergence - the ability to point both eyes more accurately at a target. Size:beads diameter:1.8cm(0.7'') Rope length:260cm(102'') Package includes:a cord, three beads, and one case Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Brock String - used in fixing convergence insufficiency and sports training. The basic purpose of the Brock String is to develop good binocular functions; in other words to get both eyes working together well.
