In recent years, studies have shown that drinking coffee may reduce the risk of suffering from cancer, diabetes, gallstones, and Parkinson's disease diseases. Now, Japanese researchers found that caffeine can also treat the dry eyes .University School of Medicine, Tokyo, Japan, the researchers conducted a study on 78 patients with dry eye. The results show that as long as patients taking pills containing caffeine, tears will be increased significantly, to moist eyes. Thus it prove to be true that caffeine can indeed treat dry eyes.