Research shows that acupuncture increases blood flow to the eyes and the surrounding area, as well as stimulates different neurological parts of the brain. Ocular Doppler-test that measures the blood flow and research that has shown that acupuncture increases blood flow to the eyes. Functional MRI tests show that acupuncture may activate and suppress certain areas of the brain involved in visual perception. We can measure some of the effects of acupuncture, but at this time we do not yet have a full understanding of how the whole mechanism works, and more research is needed and is being done.