Based upon studies and histological evidence, investigators and study sponsor suspects that the primary mechanism that causes CAA in the brain (and increased risk of ARIA) may also occur in the retina. Investigators propose use of both amyloid brain PET imaging, MRI, and retinal imaging to determine if patients undergoing Lecanemab treatment allows for in the ability to correlate ARIA from retinal amyloid and vasculature versus MRI criteria, and a measurable reduction in amyloid in the retina when compared with amyloid PET scans of the brain post-treatment.
