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.
Share this with others: Caffeine can be a headache trigger or headache inhibitor. Caffeine can be found in beverages, chocolate and even in some popular over-the-counter and prescription pain relievers. Before a headache or migraine, blood vessels tend to enlarge. Because it contains âvasoconstrictiveâ properties that cause the blood vessels to narrow and restrict blood flow, caffeine can aid in head pain relief.