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Nystagmus blockage syndrome
Strabismus
Key Points
- •NBS is an esotropia secondary to convergence effort used to dampen congenital nystagmus - it is NOT a primary strabismus.
- •The key diagnostic sign is that nystagmus decreases with convergence (esotropia increases) and increases when convergence is broken (one eye occluded or eyes abducted).
- •Under general anaesthesia, the esotropia resolves or significantly decreases and nystagmus becomes more prominent - distinguishing NBS from true infantile esotropia.
- •Misdiagnosis as infantile esotropia and standard medial rectus recession is the most significant complication - it disrupts the convergence dampening mechanism and worsens nystagmus.
- •Surgical treatment is augmented bimedial recession (5–7 mm per muscle) - larger dosing than standard esotropia surgery to weaken the convergence mechanism.
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17 more sections are included with the Clinical plan.
- Definition
- Epidemiology
- Aetiology and causes
- Pathogenesis
- Classification
- Risk factors and associations