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.
1. The University of Georgia has found that a moderate dose of caffeine (about two cups of coffee) can reduce post-workout pain by up to 48% . Anyone who has ever done any weight training is familiar with the pain of sore muscles. Itâs particularly nasty if you are new to exercise (or have laid off for a while).