The Challenge of Strabismus Surgery for Patients with Hemianopic Visual Field Defects Associated with Ocular...

Area of Science:

• Ophthalmology
• Neuro-ophthalmology

Background:

• Strabismus (eye misalignment) accompanying hemianopia (partial vision loss) presents significant therapeutic challenges.
• Surgical correction of strabismus in these cases risks diplopia (double vision) and visual field reduction.

Observation:

• Four cases of hemianopia with strabismus were analyzed: two homonymous and two heteronymous.
• Two cases had neoplastic origins, and two were traumatic.
• Three patients underwent strabismus surgery, with only one achieving a favorable outcome; the other two experienced recurrence and diplopia.

Findings:

• Exotropia may be a compensatory mechanism for homonymous hemianopia, where eye realignment can decrease binocular visual fields and induce diplopia.
• Heteronymous hemianopias carry a lower risk of surgical diplopia, but strabismus remains unstable without binocular vision if macular function is compromised.
• Coexisting cranial nerve or gaze palsies can also cause strabismus in hemianopic patients.

Implications:

• Pre-operative counseling regarding surgical prognosis, objectives, and potential outcomes is essential for patients with hemianopia and strabismus.
• The management of strabismus in the context of hemianopia requires a nuanced approach, considering the type of visual field defect and potential impact on binocular function.
• Further research into optimal surgical strategies and management protocols for this complex patient population is warranted.