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. 2020 Oct 16;11:578698. doi: 10.3389/fneur.2020.578698

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Copyright © 2020 Mejia-Vergara, Restrepo-Jimenez and Pelak.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Flow Diagram. PRISMA flow-diagram of electronic database search in Pubmed, Embase, and Latindex. The diagram shows the systematic search of the Pubmed, Embase, and Latindex electronic databases of publications from January 2000 to July 2019. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses Protocols (PRISMA-P) guidelines (18) were used to assess the current state of knowledge regarding pre-dementia stage of Alzheimer's disease, Mild Cognitive Impairment (or MCI) and retinal measures by optical coherence tomography.