This means that you have 3.00 diopters of farsightedness on your right eye and 2.50 diopters of farsightedness on your left eye.Ī contact lens marked with plano provides no visual correction.Īnother way of saying this is to use the digit 0.00Įxample: Your contact lens prescription says OD -3.00 and OS 0.00. Your contact lens prescription says OD +3.00 and OS +2.50.This means that you have 3.00 diopters of nearsightedness on your right eye and 2.50 diopters of nearsightedness on your left eye. Your contact lens prescription says OD -3.00 and OS -2.50.If the number is positive (+) it means that this eye has hyperopia, farsightedness. If the number is negative (-) it means that this eye has myopia, i.e. Instead, the number that shows what correction each eye need is written down right next to the abbreviations OD and OS (or OU). On your contact lens prescription, you might not find any of these abbreviations. The strength of correction provided by a contact lens will be shown after the abbreviation PWR or SPH on the box when you buy contact lenses in English. Diopterĭiopter is a unit of refractive power that is equal to the reciprocal of the focal length in meters of a lens.ĭiopter is usually abbreviated as D on contact lens prescriptions. If you see OU on your contact lens prescription, it means that the prescription is the same for both eyes. OS is an abbreviation of oculus sinister, which is Latin for left eye. OD is an abbreviation of oculus dexter, which is Latin for right eye.
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