It’s time to start eating more pistachios because a new study has found the popular nut can preserve your eye health. A member of the cashew family, pistachios come from a small tree that originated in Persia, and the small, green nuts could be the key to healthier eyes. Eating pistachios can improve your eye healthThe study, led by a researcher from Tufts University in Massachusetts and published in the Journal of Nutrition discovered that pistachios increase something called macular pigment optical density (MPOD) in healthy adults. MPOD measures the levels of three pigments called carotenoid…