What does contacts power mean

Having a valid prescription is obviously essential, but we trust you to take your eye health into your own hands. If you would like us to verify it, we're happy to do that too. For new contact lens wearers, this video will be especially handy in helping you to learn how to read your prescription correctly. A written prescription usually includes the following specifications: base curve, diameter, power or sphere , and then additional figures for Cylinder and Axis if you have astigmatism , and Addition and Dominant figures for presbyopia correction.

The prescription for your left and right eye will be listed separately as they may vary. Acuvue Oasys and an expiry date, which is usually a year from the date of your check-up. Below is an example of the prescription listed on the side of the box for 1-Day Acuvue Moist for Astigmatism. Please be aware that a contact lens prescription is different from a glasses prescription, so you cannot use one for the other. Base Curve BC : The base curve determines what type of fit is required for the lens to meet the curve of your eye; this is usually written in millimeters or sometimes with the words: flat, median or steep.

Diameter DIA : The diameter of the contact lens is also written in millimetres and determines the width that best fits your eye. This will be followed by a number that goes up from 0 in measures of 0. The exact prescription can be determined only with diagnostic lens fitting by an eye care professional. For the left eye, it's possible that a spherical soft lens with a correction identical to the glasses prescription You are entitled to a copy of your contact lens prescription once it has been finalized.

The point at which your Rx is final is the decision of your eye care practitioner. In some cases this can occur after the diagnostic fitting. If the lenses will not be dispensed by the prescribing practitioner, it is important that whoever fills the prescription does so completely and accurately.

A soft lens Rx typically includes a lens material name, design, power, base curve, and diameter. GP lens prescriptions usually have this information and more, such as the peripheral curve radii, center thickness, a special peripheral design and an optical zone diameter. All rights reserved. Only a small percentage of eyeglass prescriptions include prism. In this case, the eye doctor has prescribed There is no astigmatism correction for this eye, so no cylinder power or axis is noted.

This doctor has elected to add "SPH," to confirm the right eye is being prescribed only spherical power. Some doctors will add "DS" for "diopters sphere;" others will leave this area blank. The left eye OS is being prescribed The cyl power has its axis at the meridian, meaning the horizontal degree meridian of the eye has no added power for astigmatism and the vertical degree meridian gets the added In the right eye, the prism is base down BD ; in the left eye, it's base up BU.

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