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A large number of people in the world have less than 20/20 vision. There are a number of sight conditions that may require the use of glasses or contacts.

Before you learn about the types of eye problems most commonly treated with contacts, you should understand how the eye is supposed to work.

Your eyeball is meant to be completely round. The shape allows light from anything you look at to focus precisely on your retina. Your eyes automatically refocus according to how close an object is by changing the shape of your lens. When your eyes are not round or do not automatically adjust to the nearness of an item, you have a problem.


If you are shortsighted, you cannot see long distance. Close up vision will be near perfect in many cases. The mechanics of being shortsighted are fairly simple. Light from anything you look at is being focused in front of the retina instead of actually on it.

The reason for this is that your eyeball is probably longer than usual. If your eyeball is football shaped, the light will not focus properly.


Being longsighted is essentially the opposite of being shortsighted. You will be able to see objects in the distance fairly well, but anything closer will be difficult to view. In this case, the eyeball is usually slightly flattened. The light from viewed objects focuses beyond the retina, not on it.


When the eye is shaped like an egg, it affects your vision. One part of the eye will be curved too much and the other will be too flat. The vast majority of people have some form of astigmatism, but it becomes a problem when the shape is too pronounced.

When you have astigmatism, light is refocused in two positions. The stronger curve tends to focus forward, while the flatter part focuses further back. The changes cause shapes to look distorted. On an eye exam, you may mistake the G for a C or Z for 2.


Everyone’s eyesight changes as they age. Older eyes tend to change shape. They also lose the ability to adjust for the nearness of objects as the lens in the eye becomes less flexible. You may find it difficult to focus on things close up. Many people use reading glasses when they begin to lose this ability.

All of these problems can be corrected with the proper contact lenses, available at The lenses will correct your vision so that the light is properly reflected and focused on the retina. With the correct prescription, you should be able to see perfectly.

It’s a good idea to see your eye doctor regularly, particularly if you are over 45. Your eyes may be changing, but that doesn’t mean you have to settle for less than perfect vision. The sooner you catch eye conditions, the sooner you will be able to fix them with contacts or eyeglasses. You may even find that your eyes improve over time with the proper treatment.


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