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. 2019 Oct 22;13:371. doi: 10.3389/fnhum.2019.00371

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Copyright © 2019 Freitag, Hunold, Klemm, Klee, Link, Nagel and Haueisen.

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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Box-and-whisker plots of retinal vasodilation after provocation with flicker light stimulation (FLS) and electrical and flicker light stimulation (ES+FLS). The left column shows the values of the 400 μA group for the investigated vessel segments (from top to bottom): superior temporal artery (sTA); inferior temporal artery (iTA); superior temporal vein (sTV); inferior temporal vein (iTV). Correspondingly, the middle column shows the diagrams of the 800 μA group and the right column the diagrams of the 1200 μA group. Statistically significant differences are indicated with ^∗ (paired t-test, p < 0.05).