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.
Researchers from the National Institute of Allergy and Infectious Diseases found that caffeine interferes with receptors that control inflammation and may hinder function, but it does not affect uric acid levels in connection with gout or interfere with the immune system, which is linked to RA.