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Convergence substitution for paralysed horizontal gaze

B Beigi1, M O'Keeffe, P Logan

  • 1Department of Neuro-Ophthalmology, Beaumont Hospital, Dublin, Ireland.

The British Journal of Ophthalmology
|March 1, 1995
PubMed
Summary
This summary is machine-generated.

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Patients with horizontal gaze palsy developed involuntary convergence to aid vision. This finding, termed convergence substitution, aids in diagnosing gaze-induced strabismus.

Area of Science:

  • Ophthalmology
  • Neuroscience

Background:

  • Horizontal gaze palsy affects the ability to move eyes side-to-side.
  • One and a half syndrome and nuclear sixth nerve palsies are specific types of horizontal gaze palsy.

Observation:

  • Three patients with horizontal gaze palsy were studied.
  • A late feature observed was the involuntary use of convergence to assist horizontal gaze.
  • All patients exhibited adduction of both eyes and miosis during attempted gaze into the paralyzed field.

Findings:

  • The study identified convergence substitution as a compensatory mechanism in horizontal gaze palsy.
  • This substitution involves the involuntary inward turning of both eyes (adduction) and pupil constriction (miosis).
  • The phenomenon was observed in patients with both one and a half syndrome and bilateral nuclear sixth nerve palsies.

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Implications:

  • Convergence substitution should be considered in the differential diagnosis of gaze-induced strabismus.
  • Understanding this mechanism can improve diagnostic accuracy for complex eye movement disorders.
  • This highlights the brain's adaptive capacity in response to neurological deficits affecting eye control.