How To Read Your Prescription

How To Read Your Prescription

When ordering prescription eyeglasses online be sure your eye doctor writes your Pupil Distance (PD)measurement on your prescription. This ensures the optical center of your lenses will be exactly in front of your pupils.

Your prescription can be measured by an eye doctor, optometrist or ophthalmologist.  Your prescription belongs to you and you should get a copy of your prescription with Pupil Distance (PD) on it.

If you are not comfortable filling your prescription out online, you can send your prescription by fax or e-mail and our experts will fill it out to you.  We highly recommend that you either fax or email your prescription to us.  We can analyze your prescription and find the best prescription lenses  for you.

Here is an example with detail explanation of your prescription.

  Prescription Table (833x478)


OD: Right eye.
OS: Left eye.
SPH: (Sphere) Over power.
CYL: (Cylinder)  The power of astigmatism.
AXIS The amount of rotation of the cylindrical lens in degrees
ADD: The power added to the distance for the middle or the bottom half of the bifocals/progressives.
PRISM/BASE:   Prism is used to treat people with a muscular imbalance or other conditions like a squint or lazy eye. While the prism value refers to the displacement of the image through the lens, the base value refers to the direction of this displacement.
PD: (Pupil Distance) The distance between your right pupil and left pupil.
BALANCE: If there is little or no vision in one eye, the optician will mark "balance" on your prescription to ensure that your lenses will have similar weight and thickness for cosmetic reasons.  If you have "balance" marked on your prescription, please enter this information in the "Special Information"  box.
PL or PLO: (Plano) It means no strength for Sph in your prescription.

If you have any questions, please feel free to CONTACT US.