A recent small study came out that discovered a correlation between drinking caffeinated tea and lowering the risk for individuals developing glaucoma. Glaucoma is a condition in which the intraocular pressure of excess fluid can build up inside the eye, leading to damage to the ocular never causing permanent damage to the vision. The statistics show that only caffeinated tea delivers any results in this study. And it has to be tea, coffee, decaffeinated or caffeinated, does not work the same, neither does decaffeinated tea. Also, participants have to drink at least one cup of tea daily to have the desired effects of the study.
This study does have its drawbacks. For example: these studies come out once a year as part of the National Health and Nutrition Examination Survey (NHANES). The NHANES survey about 10,000 individuals yearly. On that survey individuals are asked about their beverage consumption and if they drink any caffeinated beverages. This year, NHANES also performed glaucoma testing on 1678 individuals, 84 of whom had developed glaucoma. Those that drink caffeinated beverages were never quizzed about how much tea they were drinking, what kind, or when they started so even though there is a correlation, there us no hard evidence to support this theory.
I think studies about these things are a good idea, but I also would not publish initial findings until I had some sound evidence to back up my report. To publish findings that tea may reduce glaucoma risks in individuals who drink it, is like threading a needle in pitch dark; you have a 50/50 chance of threading the needle or getting poked in the finger. Here is the article to read for yourself and remember to drink your tea!