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Skew deviation and inferior oblique palsy
S P Donahue1, P J Lavin, B Mohney
1Department of Ophthalmology and Visual Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-8808, USA. sean.donahue@mcmail.vanderbilt.edu
American Journal of Ophthalmology
|November 13, 2001
Summary
Ocular tilt reaction can mimic inferior oblique palsy. Cyclotorsion patterns and associated neurological findings help differentiate these conditions, guiding appropriate diagnosis and treatment for vertical deviations.
Area of Science:
- Neuro-ophthalmology
- Vestibular system disorders
- Strabismus
Background:
- Inferior oblique palsy (IOP) is a common cause of vertical strabismus.
- Ocular tilt reaction (OTR) can present with similar symptoms, complicating diagnosis.
- Differentiating between IOP and OTR is crucial for effective management.
Observation:
- This study describes six patients with OTR mimicking IOP.
- Patients presented with specific ocular motility and neuro-ophthalmologic findings.
- Key observations included excyclotorsion of the hypotropic eye and incyclotorsion of the hypertropic eye, contrary to typical IOP patterns.
Findings:
- Five patients showed signs suggestive of IOP on motility testing and the three-step test.
- All patients exhibited abnormal cyclotorsion patterns inconsistent with isolated IOP.
- Associated neurological findings were present in all patients, suggesting a central cause.
Implications:
- Skew deviation (a form of OTR) should be considered in patients with vertical deviations, especially after head trauma or with neurological signs.
- Distinct cyclotorsion patterns aid in clinically differentiating OTR from IOP.
- Damage to otolithic pathways may underlie these deviations, impacting vestibular-ocular reflexes.