Peripapillary retinal nerve fiber layer thickness (pRNFL) in patients with Alzheimer's disease (AD) and controls; pRNFL thickness in μm (means, 95% CI) in patients with AD (n = 57, red) and controls (n = 85, blue) in a TSNIT plot, showing pRNFL thickness in different sectors (temporal, temporal superior, nasal superior, nasal, nasal inferior, temporal inferior, and temporal). Mean pRNFL is shown in dashed lines.