2020–2021 BCSC Basic and Clinical Science Course™
Chapter 7: The Patient With Abnormal Ocular Motility or Diplopia
Myopathic, Restrictive, Orbital, and Other Causes of Diplopia
If cancer infiltrates the orbit, especially cancer from the surrounding paranasal sinuses, eye movements may be impaired, either because of extraocular muscle infiltration or involvement of the ocular motor CNs. Relative enophthalmos or associated eyelid “hang-up” on downgaze may accompany the diplopia. Occasionally, extraocular muscles may be metastatic tumor sites.
Excerpted from BCSC 2020-2021 series: Section 5 - Neuro-Ophthalmology. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.