Refractive errors are classified as myopia, hyperopia, presbyopia or astigmatism. In nearsighted eyes, the image isn't focused correctly inside the eye, causing blurring in the distance. The more nearsighted you are, the more blurred the distant object appears, and the thicker your glasses. Most myopic individuals feel that their condition is severe, due to their dependence on glasses and contact lenses. People with hyperopia see blurry at distance and near, but especially at near.
Young people can overcome some hyperopia by using their focusing muscles to make the image clear.
This ability is reduced with age. Currently, there are limited options to correct hyperopia. Most procedures are still under development. Astigmatism is a condition where the cornea is oval shaped , instead of round. Objects look distorted at both distance and near.