Farsightedness (Hyperopia), nearsightedness (myopia) and astigmatism are conditions caused by small deformities in the shape of the eye. They can both be treated with glasses, contacts, or Laser Vision Correction (LVC).
Farsightedness occurs when the eye has a slight vertical oval shape, moving the lens closer to the retina than it should be. This makes it difficult to focus on objects that are close to you, but your long-distance vision is unaffected. Farsightedness often a genetic trait you inherit from your parents.
Astigmatism occurs when the eye has an irregular curvation. As a result, some experience trouble focusing on objects, causing blurred images, making it difficult to see clearly at all distances.
Those who are nearsighted have an eye with a horizontal oval shape, meaning that the retina is further away from the lens than in should be. This means that objects far away are often blurry, but objects held up close are in focus.