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In this pilot study, we investigated the correlation between the retinal vascular complexity and neurodegenerative changes in patients with Cl using a low-cost multimodal approach. Quantification of the retinal structure and function were conducted for every subject (n = 69) using advanced retinal imaging, full-field electroretinogram (ERG) and visual performance exams. The retinal vascular parameters were calculated using the Singapore Institute Vessel Assessment software. The Montreal Cognitive Assessment was used to measure CI. Pearson product moment correlation was performed between variables. Of the 69 participants, 32 had CI (46%). We found significantly altered microvascular network in individuals with CI (larger venular-asymmetry factor: 0.7 +/- 0.2) compared with controls (0.6 +/- 0.2). The vascular fractal dimension was lower in individuals with CI (capacity, information and correlation dimensions: D-0, D-1, and D-2 (mean +/- SD): 1.57 +/- 0.06; 1.56 +/- 0.06; 1.55 +/- 0.06; age 81 +/- 6years) vs. controls (1.61 +/- 0.03; 1.59 +/- 0.03; 1.58 +/- 0.03; age: 80 +/- 7 years). Also, drusen-like regions in the peripheral retina along with pigment dispersion were noted in subjects with mild CI. Functional loss in color vision as well as smaller ERG amplitudes and larger peak times were observed in the subjects with CI. Pearson product moment correlation showed significant associations between the vascular parameters (artery-vein ratio, total length-diameter ratio, D-0, D-1, D-2 and the implicit time (IT) of the flicker response but these associations were not significant in the partial correlations. This study illustrates that there are multimodal retinal markers that may be sensitive to CI decline, and adds to the evidence that there is a statistical trend pointing to the correlation between retinal neuronal dysfunction and microvasculature changes suggesting that retinal geometric vascular and functional parameters might be associated with physiological changes in the retina due to CI. We suspect our analysis of combined structural-functional parameters, instead of individual biomarkers, may provide a useful clinical marker of CI that could also provide increased sensitivity and specificity for the differential diagnosis of CI. 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