However, coffee is not without its benefits. The results were published earlier this year in the New England Journal of Medicine found that four to five cups of coffee per day likely to reduce the risk of heart disease, stroke, and diabetes.
Be careful with excessive coffee consumption. According to a study in the United States, consuming more than three cups of coffee per day can increase the risk of blindness. Consumption of moderate amounts of coffee can develop the glaucoma, a condition that damages the eye.
The results, published in the journal Investigative Ophthalmology & Visual Science suggests that coffee lovers coffee intake should be lowered to prevent both conditions.
Glaucoma occurs when the drainage tubes in the eyes are slowly blocked. This prevents the flow of fluid in the eye is normally thus increasing the pressure. When the fluid can not flow smoothly, pressure will accumulate. This can damage the optic nerve that connects the eye to the brain and nerve tissue of the retina.
Researchers from Brigham and Women's Hospital Boston said that the components found in coffee may increase the pressure inside the eye, causing vision impairment known as glaucoma.
Previous research also found that people at highest risk Scandinavians having glaucoma. They are also consumers of coffee in the world.
This latest research looked at more than 120 thousand people in the UK and the U.S. are aged 40 years and did not have glaucoma. Participants were asked to answer questions from a questionnaire on how much coffee and their health records to see the history of glaucoma.
