Brock String – Basic Brock

The Brock String is the basis for some wonderful activities, helpful in developing visual skills. Brock Strings are used to

  1. Create awareness of space and depth.
  2. Increase the range of motion of the eyes.
  3. Increase accuracy and range of targeting.
  4. Improve scanning ability.

Basic Brock

Photo shows how when viewing one bead, the other beads should appear to be 'doubled'. This is the normal expected response.

These simple routines help to reinforce near ranges by adding the strong impulse to lock on to a target after a ‘jump’ eye movements, known as saccades.


  1. Begin in the starting position. The string should have 3 or 4 beads on it spread evenly over no more than 50cm of string.
  2. Watch the following video. It is important to ensure the client is not only moving the eyes from one target to the next, but that they are also aware of the doubling of the string and the beads other than the target bead.
  3. Always pay attention to the positioning of the client’s eyes. Ask yourself if the eyes are aligned with the target. If they eyes are not able to target a particular bead at the same time, the exercise must be unloaded (made easier) by moving the beads nearer or further away, or the activity should be abandoned entirely. See your optometrist if you have questions.
  4. Alternate the sequencing as much as you can. Try in predictable patterns, like 1-2-3, 1-2-3, or 3-2-1, 3-2-1, or 2-1-3, 2-11-3.


See Also:

You should study all notes relating to Brock String activities prior to attempting them. Always follow the guidance of your vision care provider. Do not exceed what clients can comfortably tolerate.