This precise angular measurement ensures that the lens is ground to match the unique shape of the eye. The Role of the Sphere Value The sphere column is the most prominent section of the spectacle rx od os portion of your prescription.
OD OS Lens Order Guide Prescription: Understanding Your Measurements
Conversely, a plus sign (+) indicates a convex lens for hyperopia, converging light rays to improve near vision. In a spectacle rx od os for multifocal or reading glasses, you will often find an "Add" column.
The sphere measurement, indicated by numbers such as -1. The Addition for Presbyopia As the eye ages, the natural lens loses flexibility, a condition known as presbyopia.
OD OS Lens Order Guide Prescription: Understanding the Numbers
The numerical value, such as -3. Prism Correction for Alignment.
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