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Fourth nerve palsy with monovision.

Pauline HN Yeung1, Andrew KC Lam

  • 1Department of Optometry and Radiography, Hong Kong Polytechnic University, Hung Hom, Hong Kong.

Clinical & Experimental Optometry
|December 17, 2002
PubMed
Summary

Fourth cranial nerve palsy causes vertical eye deviation and head tilt. This case report details managing a long-standing palsy with monovision spectacles for improved vision.

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Area of Science:

  • Ophthalmology
  • Neurology

Background:

  • The fourth cranial nerve (trochlear nerve) is susceptible to damage, leading to vertical ocular deviations.
  • Patients often present with a compensatory head tilt, typically to the right.

Purpose of the Study:

  • To report a case of long-standing fourth nerve palsy.
  • To illustrate the diagnostic utility of the Parks-Bielschowsky three-step test.
  • To present a management strategy for symptomatic relief.

Main Methods:

  • Clinical case presentation.
  • Application of the Parks-Bielschowsky three-step test for diagnosis.
  • Prescription of monovision spectacles for visual rehabilitation.

Main Results:

  • A 45-year-old woman with long-standing fourth nerve palsy was successfully managed.
  • The Parks-Bielschowsky test aided in identifying the paretic extraocular muscle.
  • Monovision spectacles provided satisfactory binocular vision for both distance and near tasks.

Conclusions:

  • Fourth cranial nerve palsy can result in significant visual disturbances.
  • The Parks-Bielschowsky three-step test is a valuable diagnostic tool.
  • Monovision spectacles offer an effective management option for certain cases of fourth nerve palsy.

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