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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
07:06

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Published on: March 29, 2022

Divergence insufficiency associated with high myopia.

Hiromi Kohmoto1, Kenji Inoue, Masato Wakakura

  • 1Inouye Eye Hospital, Chiyoda-ku, Tokyo, Japan.

Clinical Ophthalmology (Auckland, N.Z.)
|February 12, 2011
PubMed
Summary
This summary is machine-generated.

High myopia, characterized by a long ocular axis, may mechanically cause divergence insufficiency due to extraocular muscle shifts. This finding suggests high myopia is a risk factor for this vision disorder.

Keywords:
MRIdivergence insufficiencyextraocular musclehigh myopia

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Area of Science:

  • Ophthalmology
  • Neuro-ophthalmology
  • Medical Imaging

Background:

  • Divergence insufficiency is typically considered a neurological condition.
  • High myopia is not commonly recognized as a cause of divergence insufficiency.
  • This study addresses the frequent observation of divergence insufficiency in patients with high myopia.

Purpose of the Study:

  • To document cases of divergence insufficiency in high myopia patients.
  • To investigate potential mechanisms linking high myopia and divergence insufficiency.
  • To examine the role of ocular structures in this association.

Main Methods:

  • Investigated 20 high myopia patients with divergence insufficiency, 20 high myopia patients without diplopia, and 10 controls.
  • Utilized magnetic resonance imaging (MRI) to analyze extraocular muscle (EOM) path shifts and eye angles.
  • Measured ocular axis length and orbital dimensions for statistical comparison.

Main Results:

  • High myopia patients with divergence insufficiency showed significantly higher EOM angles compared to controls.
  • Ocular axis length was notably longer in high myopia patients with divergence insufficiency.
  • Orbital lengths differed significantly between high myopia patients with and without divergence insufficiency.

Conclusions:

  • Observed nasal shift of the superior rectus and inferior shift of the lateral rectus in high myopia patients with divergence insufficiency.
  • Divergence insufficiency may result from mechanical EOM shifts in eyes with a long axis.
  • High myopia with an elongated ocular axis is identified as a potential risk factor for divergence insufficiency.