📖 Static demo — read-only snapshot
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Brock String
Positions & Range of Motion
- Start
- Seated upright, string held from the bridge of the nose to a fixed anchor point, gaze fixating the nearest bead
- End
- Gaze converged sequentially onto each bead along the string so the fixated bead appears single with two strings crossing through it (physiological diplopia of the others)
- Range of Motion
- No joint motion — ocular vergence and accommodation excursion only; head held still
How to Perform
A string with 3–5 colored beads is held from the bridge of the nose to a fixed point. The user fixates each bead in sequence; correct fixation produces a single bead with two strings crossing through it (physiological diplopia of the un-fixated beads).
Opens a YouTube search for “Brock String”
Coaching Cues
- 1
When fixating the bead, the other beads should appear doubled — that's the X pattern of physiological diplopia
(verbal) - 2
If one string disappears, that eye is suppressing — close the other and reopen to re-engage
(verbal)
Evidence-Based Dosing & EMG Data
5–10 minutes/day as part of an office-based vergence program (CITT pattern).
Muscles Involved (0)
No muscles linked.
Easier Variations ↓
Two-Bead String
Reduce to two beads at fixed distances to simplify the vergence task.
Harder Variations ↑
Jump Vergence with String
Alternate fixation between far and near beads without smooth scan.
Research Notes
Develops fusional vergence awareness and helps suppress suppression. Evidence sits within the broader CITT vergence/accommodative therapy program rather than as an isolated intervention [Scheiman 2020 Cochrane; Chang 2021 Ophthalmology].