Increased Visual Sensitivity and Occipital Activity in Patients With Hemianopia Following Vision Rehabilitation

Area of Science:

• Neuroscience
• Ophthalmology
• Rehabilitation Medicine

Background:

• Hemianopia, a common visual field loss from brain injury, significantly impacts quality of life.
• Current rehabilitation options for hemianopia are limited, with deficits often considered permanent.

Purpose of the Study:

• To investigate functional and structural brain changes associated with visual rehabilitation in hemianopia.
• To identify neural mechanisms underlying visual improvement after long-term training.

Main Methods:

• Seven participants with hemianopia underwent a 3-6 month visual training program.
• Psychophysical tests and magnetic resonance imaging (MRI) were conducted before and after training.
• A control group received psychophysical tests without training.

Main Results:

• Trained participants showed significant improvements in Gabor detection, moving dot detection, and direction discrimination.
• Psychophysical improvements correlated with enhanced visual field sensitivity in the trained region.
• Increased neural response in motion area V5/hMT was observed in the blind visual field post-training.

Conclusions:

• Visual rehabilitation training can lead to measurable improvements in visual function for hemianopia patients.
• Enhanced activity in V5/hMT plays a critical role in boosting visual function after training.
• Findings may help identify suitable candidates for training and inform adjunct interventions.