Your vision is impaired when your eye's refractive ability is inaccurate. It may be that your cornea is either too curved or not curved enough to refract the light probably. And when this happens, the effect is vision inaccuracies that result in blurry vision for either close up or far away objects. To decide which lens is right for you, it's important to know how contact lenses work.
Inventors have been trying to correct vision for centuries. The magnification properties of water and then glass led to the invention of the first pair of eyeglasses. Some took the invention even further and the idea of being able to place the eyeglass lens directly on the eye to correct vision was how the first contact lens came about.
Contacts and eyeglasses do the same thing. They both compensate for your eyes' refractive errors. For example, if your cornea is too curved or your eyeball is too long, that is causing you to be nearsighted, which means you cannot see objects clearly that are far away. The contact lens or eyeglasses are shaped to adjust the focus of the light entering your eye to compensate for your vision inaccuracies.
Contact lenses have made many improvements since the first pair was invented in 1888. Those early contacts were made of hand-blown, brown glass and fit over your entire eyeball. They were very uncomfortable, did not allow air into your eyes and were kept "lubricated" with a sugar solution. Since then, the developments have sprung forward by leaps and bounds.
During an eye exam, your optometrist or ophthalmologist will evaluate your level of vision and use many pieces of equipment to get the exact measurements of your eye and cornea. With these facts along with your personal information about your vision expectations and habits, he or she will be able to prescribe the most appropriate type of contact lens for you.
It is a misnomer that contact lenses make actual contact with your eye. As a matter of fact, they float on the natural layer of tears that always covers your eyes. Once the properly prescribed and fitted lenses are placed on your eyes, the light has to pass through the lens first. The contact lens refracts the light in a way that counteracts the way your own eye is refracting the light. Your eye and the contact lens work together to adjust the light so it is corrected. This results in dramatically improved vision. In most cases, your vision is corrected to what is considered perfect vision, or 20/20. The measurement 20/20 means that you can see clearly at 20 feet what someone with perfect vision can see at 20 feet. If, without your contacts, your vision is measured at 20/80, which means that objects you can see clearly at 20 feet, a person with perfect vision can still see that same object clearly at 80 feet.
New innovations are being made in contact lenses all of the time. By knowing how contact lenses work and keeping up with the newest products, you will be able to choose the contact lens that is right for you.
Want more information on how contact lenses work and purchasing contact lenses? Try visiting http://www.contactlensesguideonline.com, a popular website that offers tips, advice and resources related to contact lenses, buying contact lenses, contact lenses for astigmatism and where to find contact lenses in Canada.
Article Source: http://EzineArticles.com/?expert=Mark_Clifton
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