Retinal nerve fiber layer thickness in amnestic mild cognitive impairment: Case‐control study and meta‐analysis

• Main Authors: Brianna Knoll, Joseph Simonett, Nicholas J. Volpe, Sina Farsiu, Mallory Ward, Alfred Rademaker, Sandra Weintraub, Amani A. Fawzi
• Format: Article
• Language: English
• Published: Wiley 2016-01-01
• Series: Alzheimer’s & Dementia: Diagnosis, Assessment & Disease Monitoring
• Subjects: Alzheimer's disease; Mild cognitive impairment; Retinal nerve fiber layer; Optical coherence tomography; Biomarkers
• Online Access: https://doi.org/10.1016/j.dadm.2016.07.004

Abstract Introduction Retinal structural changes in subjects with mild cognitive impairment (MCI) remain a subject of controversy. Methods We investigated the correlation between optical coherence tomography (OCT) of the retinal sublayers, including the retinal nerve fiber layer (RNFL), and cognitive function in subjects with amnestic MCI and compared the OCT findings with matched controls. We also performed a meta‐analysis of the world literature using a random‐effects model. Results We found no statistically significant differences in OCT between amnestic MCI (aMCI) and controls. In aMCI subjects, we found an inverse relationship between RNFL thickness and two cognitive tests (delayed story recall and a word‐list learning test and the word‐list test). The meta‐analysis revealed a statistically significant decrease in RNFL thickness in MCI subjects. Discussion The inverse relationship between cognitive testing and RNFL thickness suggests that retinal involvement may include paradoxically increased thickness of the RNFL, which could suggest gliotic reactive changes.