It can be adjusted to change the power of the lens in relation to the eye. You need the measurements when changing prescriptions for your eyeglasses. Remember that your eyeglass prescription does not apply to contact lenses. This is because the lens power is different between the two. Eyeglasses are positioned at a distance from the eyes, whereas contact lenses sit directly on the eyes.
Therefore, it is important to use your eyeglass prescription to buy eyeglasses only. If you are not sure about what your prescription means, do not be afraid to ask your eye doctor for help. How to Read Your Eyeglass Prescription. November 5, Eye Health. Axis Axis is the lens meridian that has no cylinder power to correct astigmatism. CYL The abbreviation stands for Cylinder. ADD Add stands for Addition. A Prism A prism corrects lay eyes.
Your eyeglass prescription is different from your contact lens prescription Remember that your eyeglass prescription does not apply to contact lenses. Share this page:. Related Articles. Learn about why cataracts develop and how you can lower your risk of getting them. Eyeglass Basics. This indicates the amount of lens power, measured in diopters D , prescribed to correct nearsightedness or farsightedness.
Cylinder CYL — This indicates the amount of lens power for astigmatism and represents the difference in the greatest and weakest powers of the eye, usually separated by 90 degrees. If nothing appears in this column, either you have no astigmatism, or your astigmatism is so slight that it is not necessary to correct it with your eyeglass lenses. In addition to the lens power, your contact lens prescription contains several other pieces of information related to the size of the lens.
Even the power of the lenses is generally not the same as in your eyeglass prescription. This is because: The contact lens sits on the surface of your eye, while your eyeglasses sit about mm in front of your eyes Regular soft contacts do not correct for your astigmatism, but your eye doctor will typically try to partially correct for it by changing the power of the lens.
Your prescription will also contain an expiration date. Read on to learn everything you need to know about how to read glasses and contact lens prescriptions before shopping for eyewear.
Follow our guide to find the answers on how to read glasses prescriptions:. The following tips will help you decipher and understand your eyewear prescriptions. If you get stuck, get in touch with our Customer Service team. The first four parameters have to do with your visual correction. PD is a crucial measurement we need to make your glasses. Both parameters will be required together. ADD: provides magnifying power for reading, bifocal, multifocal and progressive lenses.
These are for Anti-Fatigue lenses such as our SightRelax lenses. There is a separate prescription for your right eye and your left eye. Some glasses prescriptions also include additional numbers such as:. Prism: measured in prismatic diopter p. It is required when eye alignment needs assistance.
It is indicated as follows:. Each one of these indicators provide information about the base direction or the thickest edge of the prism. Coastal does not offer prism prescription glasses. In addition to the general parameters, eyeglass prescriptions can require a Pupillary Distance PD. Your PD is the distance between the center of one pupil the central black dot of your eye to the center of the other pupil.
It is measured in millimeters and is an important part of your prescription. PD indicates where the optical center of your lenses should be placed, so you can have the best, most comfortable vision. If you see a — , it indicates nearsightedness. In the sample below, the right eye is prescribed
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