Fig. 1From: The effect of sildenafil on retinal blood velocity in healthy subjectsRetinal Function Imager image of the macular region. A representative image acquired during the Retinal Function Imager analysis. Values indicate arterial flow velocity. Red segments are arterioles and their numerical velocity has a minus sign. Purple segments are venules and their numerical velocity is indicated by a plus sign. Scale bar = 500 μmBack to article page