Symmetry Tortoise Progressive Eyeglasses

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  • Gray
  • Brown
  • Progressive

    Progressive lenses (no line)

  • OD(Right eye)
    OS(Left eye)
  • Sphere (SPH)
  • Cylinder (CYL)
  • OD(Right eye)
    OS>(Left eye)
  • Axis
  • ADD
  • PD(Pupillary Distance)
  • Near PD
  • OD(Right eye)
    OS(Left eye)
  • Vertical (Δ)
  • Base Direction
  • OD(Right eye)
    OS(Left eye)
  • Horizontal (Δ)
  • Base Direction
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How to Read an Eyeglass Prescription
Play How to Read an Eyeglass Prescription
SPH (Sphere)

Spherical error, or overall power of lens is the basic part of your prescription. A (+) means you have trouble seeing near, and a (-) means you have trouble seeing things faraway.

CYL (Cylinder) & Axis

A cylinder value indicates astigmatisms or perpetually blurry vision. Axis—measured between 1 and 180°— tell us the orientation of the astigmatism

ADD (Addition)

This number is sometimes written NV for near vision and is used for multifocal lenses and readers


We can process prism prescriptions to correct eye orientation

Vertical Prism is used to help correct vertical eye misalignments and is prescribed in opposite directions for both eyes

Horizontal Prism is used to help correct lateral eye misalignments and is always prescribed in the same direction for both eyes

Pupillary Distance
Play Pupillary Distance
PD (Pupillary Distance)

It's just what sounds like—the distance in millimeters (mm) between your pupils. An average PD measurement is 63 mm, but varies by person. If it's not on the prescription, you can measure it yourself by:
• printing the downloadable PD ruler.
• watching our tutorial video.

How to measure your Pupillary Distance (PD)

  • Scan this QR code with your iPhone to open our PD measurement guide.

  • Follow our PD guide’s simple instructions.

  • Your PD number will be added to your prescription automatically.


A QR code can be scanned with your iPhone to automatically open the PD Tool*.

Open your camera and point it at the QR code for a few seconds to start measuring your pupillary distance.

*Our PD tool is only supported by Apple iPhone 7 or above.


PD number added to prescription.

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Would you like to upload your prescription?

At EyeBuyDirect, we take the quality of your vision seriously. If you are unsure that you've entered prescription correctly, or it's your first time purchasing glasses online, we would like to offer you the option to upload a photo of your prescription. We will use this photo to verify your order and help ensure its accuracy.

Drag prescription photo here
- or click here to select a file -


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My Prescription Image

Unfortunately, we are unable fit prism lenses to this frame. Please go back to continue without prism, or select a style from our catalog that does fit prism lenses.