Bold designs and community giving define the D. Eyewear brand. Here's what to know. For those times when you have to be on your mobile, computer, or tablet, here are options and tips for blue-light-filtering screen protectors. Health Conditions Discover Plan Connect. Medically reviewed by Ann Marie Griff, O. Abbreviations Numbers Nearsighted Farsighted Astigmatism Other recommendations Contact lenses Eye checkups Summary Regular eye exams are an important part of keeping your eyes healthy and your vision sharp.
About eye prescription abbreviations. What about the numbers? What to know about nearsighted prescriptions. What to know about farsighted prescriptions. What to know about astigmatism prescriptions. Other lens recommendations. Do contact lens prescriptions differ from those for eyeglasses? How often should you see your eye doctor? The bottom line. Read this next.
Medically reviewed by Debra Rose Wilson, Ph. What to Know About D. The AXIS, in degrees, is a number between 0 and It is used to correctly orientate the cylinder correction when making your glasses.
On some rare occasions, you may find an AXIS value with a decimal place or fraction. Prism is used to correct eye alignment issues and can be a metric or fraction value. For example, "1. However, many opticians will simply write the value somewhere under, or next to, the distance values. The "ADD" value applies to both eyes and can sometimes be written only once on the prescription, even though the addition is required for both eyes.
There are occasions where your optician will write out your complete "Distance" prescription followed by your complete "Near" prescription. See Different ways in which a prescription can be displayed below. A glasses prescription can be displayed in a number of ways. The images below show the same prescription information in two different formats. As you can see in the first example Standard GOS 2 Glasses Prescription the optician has listed the patients complete distance prescription on the top row and the complete near prescription in the bottom row.
This value is the amount to add on to the distance SPH values to ascertain what the full Near prescription should be. Balance - No values are required. This instructs the person making your glasses to use a lens of similar weight to balance out the frame. Plano, Infinity, 0. Cylinder: The cylinder CYL number indicates the lens power needed to correct astigmatism.
Axis: An axis number will also be included if you have an astigmatism. This means your lenses will be shaped to improve your distance vision. This indicates that your lens should be shaped to correct near vision. This indicates the required strength for the near prescription in your lens. Children should have their first eye exam when they are around six months old, and then another just before they start school.
In the context of an eye prescription. It will be a number between 1 and The higher the number on your prescription, the stronger your prescription is. A number with a minus symbol before it means you are nearsighted, and a number with a plus symbol, or no symbol, means you are farsighted.
A number over 5 is generally considered to be on the stronger side. This number determines the lens power needed to provide clear vision for each eye. Lens power is measured in diopters. The higher the number, the stronger the prescription. You may also see diopters expressed in decimals, such as 1. The cylinder column is only used if you have a common eye condition called astigmatism.
The cornea is the clear tissue covering your iris and pupil. An irregularly shaped cornea affects the way light rays reach your retina, distorting your vision. Changing the power in one part of your eyeglass lens will help you see clearly if you have astigmatism.
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