![]() If nothing appears in this column, either you have no astigmatism, or your astigmatism is so slight that it is not really necessary to correct it with your eyeglass lenses. This indicates the amount of lens power for astigmatism. The term "sphere" means that the correction for nearsightedness or farsightedness is "spherical," or equal in all meridians of the eye. If the number appearing under this heading has a minus sign (–), you are nearsighted if the number has a plus sign (+) or is not preceded by a plus sign or a minus sign, you are farsighted. This indicates the amount of lens power, measured in diopters (D), prescribed to correct nearsightedness or farsightedness. Your eyeglass prescription contains other terms and abbreviations as well. ![]() Other Terms On Your Eyeglass Prescription Eye doctors write prescriptions this way because when they face you, they see your right eye on their left (first) and your left eye on their right (second). On your eyeglasses prescription, the information for your right eye (OD) comes before the information for your left eye (OS). ![]() Though the use of these abbreviated Latin terms is traditional for prescriptions written for eyeglasses, contact lenses and eye medicines, some doctors and clinics have opted to modernize their prescriptions and use RE (right eye) and LE (left eye) instead of OD and OS. Your eyeglass prescription also may have a column labeled "OU." This is the abbreviation for the Latin term oculus uterque, which means "both eyes." They are abbreviations for oculus dexter and oculus sinister, which are Latin terms for right eye and left eye. The first step to understanding your eyeglass prescription is knowing what "OD" and OS" mean. This article will help you decipher all parts of your prescription and discuss it knowledgeably with an optician when you're buying eyeglasses. (If that's not the case, and you still need an eye exam, make an appointment with an eye doctor near you.)īut what do all those numbers on your eyeglass prescription mean? And what about all those abbreviated terms, such as OD, OS, SPH and CYL? He or she probably mentioned that you are nearsighted or farsighted, or perhaps that you have astigmatism. Contact us at 30.So, you've just had an eye exam and your optometrist or ophthalmologist has given you an eyeglass prescription. Brand: This is the name of the specific contact lens brand or type you’ve been prescribed.Diameter or DIA: The width of the contact lens from edge to edge, measured by millimeters.Base Curve or BC: Indicates how curved the inside of your lens is, usually ranging from eight to 10.Power, PWR, Sphere or SPH: Usually listed first after OD, OS, or OU, indicating the strength of correction needed for that particular eye.Contact lens and eye glasses prescriptions are not interchangeable. You will need a separate contact lens prescription if you want to wear contacts. This is the amount of prismatic power, measured in prism diopters that compensates for eye alignment problems. It ranges from +0.75 to +3.00 D and is the same for both eyes. This is the additional magnifying power that applies to the bottom portion of multifocal lenses to fix presbyopia. The number 90 shows the vertical meridian of the eye, and the number 180 shows the horizontal meridian.Īdd. The number in this column may be preceded with a minus sign or a plus sign (for farsighted astigmatism).Īxis: This is the lens meridian with no cylinder power, meant to fix astigmatism, represented by a number between 1 and 180. If the number under this heading features a minus sign (–), this means you’re nearsighted if it has a plus sign (+), this means you’re farsighted.Ĭylinder ( CYL): The amount of lens power for astigmatism. Sphere ( SPH): The amount of lens power, measured in diopters (D), which corrects nearsightedness or farsightedness. Your eyeglass prescription will also contain others terms and abbreviations such as: ![]() This is because eye doctors see your right eye on their left (first) and your left eye on their right (second). Nowadays, you will just see the abbreviations RE (right eye) and LE (left eye) rather than the more confusing OD and OS. ![]() They abbreviate the words oculus dexter and oculus sinister: Latin words for “right eye” and “left eye.” You may also see a column labeled “OU,” and this abbreviates the Latin term oculus uterque. The first part of getting what your eyeglass prescription means is determining what “OD” and OS” mean. We’re here to educate you on how to interpret your eyeglass or contact lens prescription. In fact, you may even know which power is for which eye, but you still don’t know why. When you look at your eyeglass or contact prescription, you will see a bunch of numbers and letters listed but you may not really know what they mean. ![]()
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