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SpinDistribute.com Article Directory

The following article was published in our article directory on December 24, 2011.
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What are the Different Features of Contact Lenses?

Article Category: Wellness, Fitness and Diet

Author Name: chickie maxwell

Buying contact lenses that are specifically fitted to your eyes ensures that you get vision correction that is even better than what you get with eyeglasses. Here is a brief breakdown of the different features of contact lenses that appear on your lens prescription so that you can make a more informed decision about which brand is best for you.

Refractive power (appears as PWR on your prescription). This refers to the amount of correction you will need from the lens to increase your vision to 20/20 or other acceptable level as determined by your eye care professional. For people with perfect vision, the refractive power will be zero while if you are nearsighted, the number will be negative and if farsighted, positive. The farther the number is from zero, the more correction will be needed. And frequently, each eye may have a different refractive power and require a different lens.

Base curve (BC). The base curve is measured in millimeters and refers to the how the contact lenses match or complement the curvature of your cornea. The lower the BC, the steeper the curve of the cornea. The closer the base curve matches your cornea, the clearer and less distorted your vision will be while wearing the lens.

Diameter (DIA). This refers to the distance from one end of the lens to the other, expressed in millimeters. The diameter of a lens is important to ensure that it is properly centered on your cornea for the best vision, as well as determining where the edges of the lens will rest on your eye. Incorrect lens diameter can cause irritation or abrasion of your eye.
Cylinder (CYL). This contact lenses feature is important if the lens also corrects for astigmatism. Astigmatism is an eye condition that results in blurred vision or a sense that each eye is seeing things slightly differently. It is caused by uneven curvature of the cornea, which impairs the focusing ability of the eyes since light bounces unevenly off their surface. The CYL number refers to the type of astigmatism in the eye: a plus number refers to myopic astigmatism or nearsightedness and a negative number means hyperopic astigmatism or farsightedness.

Axis. This refers to the orientation of the cylinder power in the contacts to make up for the cornea s irregular shape, and is expressed in degrees.

Added power (ADD). This refers to the additional magnifier power used in the part of bifocal contact lenses that are used for close-up vision. It is expressed in diopters and is usually written with a plus sign.

Now that you know the different features of contacts, you can talk with your eye care provider about which brand is best suited for your needs based on the results of your eye exam, as well as which type of contacts will provide you with the best correction. In addition, you should also decide if permanent or disposable contact lenses are more appropriate for you based on your particular lifestyle.

Keywords: contact lenses

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