Iris (Definition) The iris is a structure within the eye that helps reduce the amount of light that reaches the retina. The iris is known as the colored part of the eye, and can be blue, brown, or any color or combination of colors in between. The iris is the portion of the eye that responds to light stimulation. ...Read more.
Scientists also speculate that caffeine may provide a mood-boosting effect that helps ease pain. Regardless of the mechanism by which it works, the data does indicate that caffeine does indeed make pain medications more effective and help ease pain.
How Caffeine Helps. When your head hurts, you want relief fast. Whether itâs a run-of-the-mill tension headache or a migraine, caffeine can help. Thatâs why itâs an ingredient in a lot of popular pain relievers. It can make them as much as 40% more effective. Sometimes you can stop the pain in its tracks just by having caffeine alone.