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Brock String
Quality 6 foot Brock String
5 Colored Beads
Convergence Insufficiency Trainer
Orthoptic Device
Brand new 6 foot Brock String with five beads. This device is used in orthoptic (vision therapy) training and is useful in treating convergence insufficiency. This Brock String comes with full instructions and is designed to be used for at home therapy of your binocular vision problems. Please follow your optometrists directions. Similar devices sell for $30 each in optometry practices.