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Pseudonystagmus in trochlear nerve palsy
Ana Wert1, Maria Camila Ortiz-Usuga1, Charlotte Wolley-Dod1
1Pediatric Ophthalmology and Strabismus Department, Institute of Ocular Microsurgery (IMO), Barcelona, Spain, IMO foundation.
Summary
This case report details a patient with intermittent double vision and left hypertropia, initially diagnosed as superior oblique palsy. The condition resolved after strabismus surgery, highlighting a rare eye movement disorder.
Area of Science:
- Ophthalmology
- Neuro-ophthalmology
- Strabismus
Background:
- Superior oblique palsy can cause vertical strabismus and diplopia.
- Rhythmic alternating fixation is a rare, poorly understood phenomenon.
Observation:
- A patient presented with intermittent diplopia and left hypertropia.
- Cover testing revealed conjugate rhythmic vertical eye movements in all gazes.
- These movements were initially suspected to be rapid rhythmically alternating fixation.
Findings:
- The observed conjugate rhythmic vertical eye movements are a key diagnostic feature.
- The condition was associated with an apparent left superior oblique palsy.
- Surgical intervention for strabismus led to the resolution of the rhythmic eye movements.
Implications:
- This case expands the understanding of rare ocular motility disorders.
- It suggests a potential link between strabismus and rhythmic alternating fixation.
- Successful surgical management offers therapeutic insights for similar presentations.
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