These lenses progress from distance to intermediate to near prescription without a distinct line.ĪR – Anti-reflective. The near prescription is placed on the bottom portion of the lens and marked by a line. A lens in which the distance prescription is placed on the top of the lens. There is only one prescription throughout the lens.īF – Bifocal. Some of the terminology used to describe these features include: Lenses are made with many designs and features to optimize vision. READ MORE: Understanding Your Contact Lens Prescription What do these lens abbreviations mean? The contact lens prescription will also contain information on the power of the contact lens, the brand and type, and the expiration date. This is the size of the contact lens in millimeters. This is a measurement of how flat or steep a lens is.ĭIA – Diameter. Here is a brief summary of some terms you may see on your contact lens prescription:īC – Base curve.
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READ MORE: How to Read Your Eyeglasses Prescription What do the abbreviations on my contact lens prescription mean?Ĭontact lenses need extra measurements and have additional terms and abbreviations. Prism – This provides correction for eye misalignment. This is the measurement for the optical power of a lens.Īxis – This provides information on the orientation of the cylinder power.Īdd – This is the reading prescription that corrects for presbyopia. This means that no prescription is needed and is Latin for “flat.”ĭ – Diopter. This is the measurement used for the correction of astigmatism. This means that the correction is equal in all meridians no astigmatism exists.Ĭyl – Cylinder. This is the abbreviation for the Latin term Oculus Uterque.
This is the abbreviation for the Latin term Oculus Sinister. This is the abbreviation for the Latin term Oculus Dexter. Here is a brief summary of some of the terms you may come across on your eyeglasses prescription: RELATED READING: What’s the difference between an optometrist and an ophthalmologist? What do the abbreviations on my glasses prescription mean?Įyeglasses prescriptions have unfamiliar abbreviations that can be confusing. Understanding eye abbreviations when you visit your eye doctor will help you to make informed decisions about your eye care. This is the abbreviation for Ocular Sinister and is Latin for “left eye.” In computer terminology, OS can also refer to an operating system, but this is not what it refers to in eye care. Another abbreviation you may see on your prescription is OS. There are many abbreviations used in eye care, and sometimes it can be difficult to interpret what they all mean.
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When OD is part of your lens prescription, it is the abbreviation for the Latin term Ocular Dexter, which means “right eye.” When OD is written next to your eye doctor’s name, it is the professional abbreviation for Doctor of Optometry. The abbreviation OD is frequently used in eye care and has two distinct meanings.
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