Drinking more than 3 cups of coffee a day will make it easier for drinkers to get eye diseases like glaucoma. The study, published in the Journal of Investigating Ophthalmology and Visual Sciences, selected 79,000 women and 42,000 male volunteers from the US Nurses’ Health Status Tracking Survey and the Occupational Health Tracking Survey. These volunteers were at least 40 years old when they participated in the experiment and did not have glaucoma. Researchers from the Brigham and Women’s Hospital and Harvard Medical School in the United States obtained data on their coffee intake and previous cases. The study found that people who drank more coffee had a significantly increased likelihood of developing exfoliative glaucoma or suspected glaucoma than those who did not drink coffee at all. More interestingly, people who drink other caffeinated beverages, such as soda, tea, etc., do not increase the chance of suffering from eye diseases.