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Related Experiment Video

Updated: Aug 25, 2025

Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects
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Apparent Defective Abduction Without Diplopia.

Danny Lam1, Tyler R Blah2, Fiona S Lau3

  • 1Ophthalmology, Royal Darwin Hospital, Darwin, AUS.

Cureus
|October 19, 2022
PubMed
Summary

Sixth nerve palsies cause double vision and usually stem from neurological issues. However, apparent defective abduction without diplopia can also arise from orbital causes, requiring broader diagnostic considerations.

Keywords:
apparent defective abduction without diplopiadiplopianeuro-ophthalmologysaccadessixth cranial nerve palsy

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Area of Science:

  • Ophthalmology
  • Neurology

Background:

  • Sixth nerve palsies are characterized by horizontal diplopia and typically indicate neurological or neurovascular etiologies.
  • Clinical assessment often involves evaluating the abducting saccade velocity, which is characteristically slowed in these cases.

Observation:

  • This study presents three cases of apparent defective abduction of one eye.
  • These cases highlight that the etiology can be both neurological and orbital, challenging typical presentations.

Findings:

  • Apparent defective abduction without diplopia (ADAD) is a distinct clinical presentation.
  • The differential diagnosis for ADAD must include orbital pathologies alongside neurological causes.

Implications:

  • Clinicians should maintain a high index of suspicion for ADAD, especially in patients without diplopia.
  • Expanding the differential diagnosis to include orbital factors is crucial for accurate diagnosis and management of apparent defective abduction.