Understanding Your Eyeglass Prescription

By | March 4, 2017

Understanding Your Eyeglass Prescription You've recently had your eyes examined and you are ready for a few new prescription eyeglasses. You had been handed a bit of paper, with some numbers about it, as you left your examination. You are wondering what do those numbers mean?

Every doctor writes out their prescription different but 99 percent of all prescriptions have several abbreviations to find: OD, OS, SPH, CYL, and Axis. OD, in lay terms, means your right eye while OS is your left eye. On your own prescription, even though you don't see OD and OS written, you can infer that the right eye will always be written as the most effective group of numbers reading left to right, and your left eye is underneath group of numbers. For more details on prescription reading you can contact the eye doctors at https://www.classicspecs.com/collection/womens-eyeglasses/.

Another group of abbreviations are located at the very top of your prescription as you read from left to right. SPH means Sphere; CYL means cylinder; and Axis stands alone. Sometimes the Axis is likely to be shown with the mark of an 'X' instead of the word. The sphere means the quantity of correction you will need in diopeters to help you see near or far and the amount usually runs in quarter increments. 

The amount in your sphere will will have a plus (+) or minus (-) sign before the amount itself. Additionally, your doctor may leave the area blank, put two zeros (00), write the word plano, or write the infinity sign – all this implies is there is no prescription in the sphere for that particular eye. When inserting your prescription online, follow the site's recommendations for how exactly to fill in this number.

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