OS:Latinoculus sinister, meaning “left eye” If you have a heading labelled “OU,” which is Latin foroculus uterque, it pertains to “both eyes.” Other headings that your eyeglass prescription may have include SPH (Sphere):The number indicates the diopter (abbreviated as “D") required ...
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To understand your prescription, you should understand the meaning of each specification/figure mentioned on your prescription. What do my contact lens prescription figures mean? Once you’ve completed your contact lens fitting session, it’s time for you to get your lenses. Whether you’re lookin...
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OS: OS stands for oculus sinister, the Latin phrase for “left eye.” If both the left and right eye has the same diagnosis and prescription information, the abbreviation “OU” is used instead, or “ocular uniter,” meaning both eyes. Sphere (SPH): The SPH number corrects for nearsighte...
Prism: This is a rare term used to prescribe prismatic power for those with eye alignment problems. Terms Specific to Contact Lens Prescriptions If you receive a contact lens prescription, there are additional terms and abbreviations to help with eye prescription meaning: PWR (Power)/SPH (Sphe...
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Single Vision Prescription Lenses Prescription Abbreviations & Terminology OD– Oculus Dexter, from the Latin word dexter meaning “right”, means the right eye. OS– Oculus Sinister, sinister which is derived from the Latin word sinistra meaning “left hand”, means the left eye. ...