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How to Read an Eyeglass Prescription
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Play How to Read an Eyeglass Prescription
SPH (Sphere)

Spherical error, or overall power of lens is the basic part of your prescription. A (+) means you have trouble seeing near, and a (-) means you have trouble seeing things faraway.

CYL (Cylinder) & Axis

A cylinder value indicates astigmatisms or perpetually blurry vision. Axis—measured between 1 and 180°— tell us the orientation of the astigmatism

ADD (Addition)

This number is sometimes written NV for near vision and is used for multifocal lenses and readers

PD (Pupillary Distance)

It's just what sounds like—the distance in millimeters (mm) between your pupils. An average PD measurement is 63 mm, but varies by person. If it's not on the prescription, you can measure it yourself by:
• printing the downloadable PD ruler.
• watching our tutorial video.

PRISM

We can process prism prescriptions to correct eye orientation

Vertical Prism is used to help correct vertical eye misalignments and is prescribed in opposite directions for both eyes

Horizontal Prism is used to help correct lateral eye misalignments and is always prescribed in the same direction for both eyes

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    What Do All Those Numbers on My Lens Prescription Mean?

    It may look incomprehensible, but in reality, those numbers are easily decipherable. Basically, your eye doctor has written a series of numbers indicating the type and extent of your vision problem. For example, the spherical error (SPH) on your glasses prescription refers to how much correction you need if you are farsighted or nearsighted. If you have astigmatism, you’ll have a cylinder number indicating how much lens power you need to correct blurry, distorted vision.

    For people who need reading or multifocal correction, they’ll have an ADD (additive power) number scribbled on their prescription. And just for clarity, those “+” or “-” signs you see scattered around those numbers just tell our eyeglass prescription interpreters how much correction is needed.

    Ordering online prescription glasses also requires your pupillary distance number, or the distance between the pupils. We need this information to determine where your lenses need to be placed in the frames you select. Check out EyeBuyDirect's guide for how to read your prescription.

    Don’t Forget to Add Prism Correction to Your Orders

    When you’re entering information about your online prescription glasses, just click “add prism” and we will make sure your lens contains prism correction. Sometimes, images seen by one eye are not in line with images seen by the other eye. This means you may see two images instead of one, clear image. Lenses enhanced by prism correction ensure images remain in binocular sync so that everything you see is crystal-clear. Prescriptions specifying prism correction will also include a base number describing displacement direction.

    About Your Rx Glasses Order

    If you realize you’ve made a mistake entering prescription information, don’t panic! Just call us, give us your order number and the corrected prescription within one hour of ordering. After ordering your online prescription glasses, you can expect delivery within seven to 14 business days of placing your order. We have a variety of payment options, including MasterCard, Visa, AMEX, Discover, PayPal and Amazon.

    Your eyeglass prescription order comes with a 14-day fit and style guarantee and a 12-month guarantee overall. Browse our catalogue offering 200+ frame styles, as well as trendy tinting options to protect your eyes from UV radiation. If you have any questions about entering prescription lens information, please call 1-855-393-2891, Monday through Friday, during our regular business hours.

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