Corresponding Ganglion Cell Atrophy in Patients With Postgeniculate Homonymous Visual Field Loss

Area of Science:

• Neuroscience
• Ophthalmology
• Radiology

Background:

• Investigating retinal changes after adult-onset postgeniculate pathway injury.
• Utilizing spectral-domain optical coherence tomography (SD-OCT) to assess ganglion cell layer-inner plexiform layer complex (GCL-IPL) thickness.
• Excluding geniculate and pregeniculate pathologies through rigorous radiological assessment.

Purpose of the Study:

• To detect GCL-IPL thinning in patients with postgeniculate pathway injury.
• To quantify GCL-IPL asymmetry using normalized asymmetry scores.
• To correlate retinal changes with visual field defects and injury latency.

Main Methods:

• Retrospective review of 22 patients with postgeniculate injury and 15 healthy controls.
• SD-OCT imaging of the macula for GCL-IPL thickness analysis.
• Calculation of normalized asymmetry scores comparing ipsilateral and contralateral GCL-IPL thickness.

Main Results:

• 15/22 patients showed significant GCL-IPL thinning ipsilateral to the lesion.
• GCL-IPL asymmetry was significantly greater in patients than controls (P = 0.0004).
• Moderate correlation found between thinning magnitude and injury latency (R = 0.782, P = 0.004) beyond 150 months.

Conclusions:

• Retrograde transsynaptic degeneration causes retinal ganglion cell loss after postgeniculate injury.
• SD-OCT is effective in detecting GCL-IPL thinning indicative of such degeneration.
• Findings support a link between retinal nerve fiber layer changes and retrochiasmal visual pathway damage.