As you get older, you gradually realize that your eyes are not as good as they once were. Reading fine print becomes increasingly difficult. You might even find that you need to hold your book or newspaper farther away from you in order to be able to focus on the printed material.
How we see depends on the way our eyes interact with light in the environment. Blurry vision is caused by the refraction of light that enters into the eye. This is known as a refractory error. There are a variety of refractory error problems. These include: