Visual Perceptual Learning for the Treatment of Visual Field Defect

Study design: A PROBE (Prospective, Randomized, Open-label, Blinded-endpoint) design

Methods:

• Visual perceptual learning (VPL) group

• Visual perceptual learning (24 times for 2 months, 3 times per week) in visual field defect areas
• At baseline and post-VPL evaluations (2 months after): Structural & Functional MRIs, Visual field tests, Visual evoked potential, Visual cognitive tests, Subjective visual function questionnaires
• Control group

• At baseline and 2-months later: No VPL, Structural & Functional MRIs, Visual field tests, Visual evoked potential, Visual cognitive tests, Subjective visual function questionnaires
• Visual perceptual learning after 2-month follow-up evaluation (24 times for 2 months, 3 times per week)

(The patients who were stratified by age (over 65 years old or not) and degree of visual field defect (quadrantanopia or complete hemianopia) will be randomly assigned into the learning and control group.)

• Investigations

• Improvement of visual field test scores between VPL group and control group
• Analysis of brain network changes in MRI data
• Correlation analysis of improvement of visual field defect and MRI data
• Correlation analysis of improvement of visual field defect and visual evoked potential (VEP) data
• Correlation analysis of improvement of visual field defect and neuropsychological data

Inclusion criteria

• The patient has chronic stroke more than 6 months after onset.
• The patient has visual field defect (Quadrantanopia or Hemianopia).
• The patient has corrected eyesight 0.7 or above.

Exclusion criteria

• The patient has contraindication to MRI scan.
• The patient has cognitive impairment (Mini-Mental Status Exam score <24).
• The patient has ophthalmologic diseases (e.g., glaucoma, cataract).