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Here’s another reason to drink coffee. Research at Cornell shows that the beverage contains chlorogenic acid, a powerful antioxidant that protects the retina in the eye. According to the Cornell scientists, coffee consists of 7 percent to 9 percent chlorogenic acid, a natural chemical that may keep your eyesight from deteriorating and prevent blindness from retinal damage, glaucoma, diabetes and aging. The retina is on the back wall of the eye. It contains millions of cells that receive light and transfers the information to nerve cells. The retina is very metabolically active and consumes plenty of oxygen. That makes it highly vulnerable to oxidative stress. Coffee’s chlorogenic acid can help prevent potential damage from the by-products of this oxygen consumption