Evolution of Visual Field Defects After Occipital Stroke: A Quantitative Analysis.

Area of Science:

• Neuroscience
• Ophthalmology
• Neurology

Background:

• Homonymous visual defects are common after occipital stroke.
• Understanding the natural progression of these defects is crucial for patient management and therapeutic development.

Purpose of the Study:

• To quantitatively assess the natural progression of homonymous visual defects in occipital stroke patients.
• To utilize automated perimetry metrics for evaluating visual field changes over time.

Main Methods:

• Retrospective chart review of 73 occipital stroke patients with homonymous hemianopia.
• Analysis of repeated Humphrey perimetry (24-2 SITA standard) data.
• Tracking of perimetric mean deviation (PMD) and deficit area before and after 6 months post-stroke.

Main Results:

• Over 77% of patients showed spontaneous visual field improvements within 6 months post-stroke.
• Improvements were more significant for partial visual field defects compared to complete ones.
• In the chronic phase (>6 months), visual field measurements were largely stable, though ~50% experienced changes > ±1 dB in PMD.

Conclusions:

• Automated perimetry confirms significant spontaneous visual field recovery early after occipital stroke.
• While less frequent, visual defects can still improve or worsen during the chronic phase post-stroke.