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DVA protocol and schematic retinal vessel reaction. (A) The DVA protocol in this study consisted of a 60-s baseline measurement, 60 s of provocation, and 120 s of recovery. The provocation and recovery period were repeated once, resulting in a total duration of 420 s for a DVA measurement. (B) The retinal vessel reaction was calculated as the mean of both cycles and the maximum retinal vasodilation was determined at the end of the provocation.
