The human eye is like a giant magnifying glasses. It has a power of about +60 diopters. If the eye has too much curvature or to little curvature for its size that is when someone will need glasses. Here is a breakdown of Myopia, Hyperopia and Astigmatism and what they mean. Myopia: Aka nearsighted. Means you are able to see up close and need glasses to see far. People who are nearsighted have prescriptions with a negative sign in front of them. Essentially their eye has