Heabety 18mm Diameter Brock String Vision Convergence Insufficiency Training Tool

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 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 thing. The measurement allowed error is + - 1-3cm.