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.
Caffeine helps reduce inflammation, and that can bring relief. It also gives a boost to common headache remedies. Whether you use aspirin, ibuprofen, or acetaminophen, they work faster and better and keep the pain away for longer when combined with caffeine. A very rare condition called hypnic headaches responds especially well to caffeine. These strike older people, waking them in the middle of the night with severe pain.