How do I read my Opternative prescription?

Last Updated: Jan 08, 2016 10:34AM CST

After your new Opternative prescription is approved, you can log-in to download or print it.

Your Opternative prescription just like a prescription you would receive from an in-person eye doctor and will display values for the following aspects of your vision:

  • “OD” is the abbreviation for “oculus dexter”, which is the Latin term for “right eye”

  • “OS” is the abbreviation for “oculus sinister”, which is the Latin term for “left eye”
  • “SPH”, or “Sphere”, refers to the amount of power the lens must provide to sharpen your vision. A minus sign means this prescription is for nearsightedness (myopia), while a plus sign would mean the prescription is for farsightedness (hyperopia).

  • “CYL”, or “Cylinder”, refers to the amount of power the lens must provide to correct astigmatism.

  • “AXIS” is a number between 1 and 180 that indicates the direction of your cylinder power needed to correct astigmatism.

  • “ADD” refers to magnifying power added to a distance prescription to correct near vision for adults with presbyopia, commonly referred to as those having a need for reading glasses.

  • “Prism” (shown as a triangle symbol) refers to power needed to correct for eye alignment problems.

  • “BC”, or “Base Curve”, is a measurement of the back curvature of a contact lens and is prescribed to match or complement the curvature of your cornea.

  • “DIAM”, or “Diameter”, is a measurement of the distance from one edge of your contact lens to the opposite edge.
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