An OCI medical device comprising the following elements: - a coherent light source, - a light sensor, - a first processing unit adapted to calculate OCI Data from the light sensor, - a control unit which allows taking or loading of at least one Reference OCI Value, - a second processing unit adapted to calculate the Intra-Individual Relative Assessment of the OCI Data of an Imaging Zone and the at least one OCI Reference Value, - display means adapted to show at least one Relative OCI Value. The invention also includes different uses and a method for assessing the blood flow of a body region using OCI imaging and comprising an Intra-Individual Relative Assessment between OCI Data of the Imaging Zone and at least one Reference OCI Value.
