ITEM NAME:Diameter Brock String Vision Convergence Insufficiency Childrent Training Too3C Step: 1,Look at the red ball closest to the eye until you see the phenomenon as shown. 2,Look at the yellow ball in the middle of the eye until you see the phenomenon as shown. 3,Look at the green ball farthest from the eye until you see the phenomenon as shown. Description: Brock String - used in fixing convergence insufficiency and sports training. The basic purpose of the Brock String is to develop good binocular functions; Â in other words to get both eyes working together well. Â 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.
