If left untreated, Glaucoma can also cause permanent blindness.
Published in the British Journal of Ophthalmology, researchers in the U.S. looked at the results of eye examinations from 1,678 participants aged 40 or over, as well as analysing data from a 2005-200 nationwide health and nutrition survery.
Using data from the National Health and Nutrition Examination Survey of 3406 USA women aged over 40, researchers found that women who had their ovaries removed and used HRT had a 9% lower risk of developing glaucoma.
The researchers mentioned that they compared the hot tea drinkers in general, with those people drinking more than six cups of the brewed tea a week less probably to have the risk even whether factors such as age, body mass index, smoking and diabetes were considered.
Drink tea to prevent glaucoma.
However, no such associations were found for coffee - caffeinated or decaffeinated - decaffeinated tea, iced tea or soft drinks. It included interviews, physical examinations, and blood samples, created to measure the health and nutritional status of United States adults and children. That year, 1,678 participants agreed to share full eye test results, and of these, 84 adults were found to have a form of glaucoma.
Compared with those who did not drink hot tea every day, those who did, had a lower glaucoma risk, the data showed.
Using a validated questionnaire-Food Frequency-the participants were asked how often and how much they had drunk caffeinated and decaffeinated drinks, including soft drinks and iced tea, over the preceding 12 months.
"However, as this study looked at many dietary factors and is only a snapshot taken at a single time point, further longer term studies in the United Kingdom and other populations are needed, to see if tea drinking really does protect us from glaucoma".
The study also had other limitations, such as the small number of participants with glaucoma and a lack of detailed information about the timeline of diagnosis.
The scientists believe the antioxidants and natural anti-inflammatory chemicals in tea may play a role in protecting against this process.
Your morning cup of tea may have more power than you thought. Still, this is good news if you're a tea drinker.
"Further research is needed to establish the importance of these findings".
According to registered dietitian Andy De Santis, green, black and oolong teas contain important antioxidants known as flavonoids, which are being explored for their potential health benefits.