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About Your Glasses Rx: Buying Prescription Eyeglasses Online

OpDocs is the best place to buy affordable prescription glasses online!

Our expert team is here to help you find the best glasses for you. Follow our easy, two-step process and you will be on your way to ordering new glasses.

Step One: Find your eyeglass prescription

The first step to customizing your new prescription eyeglasses is to provide us with your current lens prescription (must be no more than one year old).

Please be sure to include a measurement called a Pupillary Distance (PD). PD is the distance between your pupils and is measured in millimeters. The PD is important, as it allows the laboratory to accurately align the lenses in your prescription eyeglasses. If your eyeglasses prescription does not have the PD, please go to Measuring Your PD.

If you have not had an eye exam for prescription eyeglasses in the last two years, you will need to be seen by your eye doctor to get a new prescription for eyeglasses.

If you have had an eye exam within two years, call your doctor for a copy of the lens prescription and the PD, if it’s available. (Upon request, your eye doctor is required by law to provide you with your prescription. It is illegal to withhold it.)

Step Two: Place Your Online Prescription Eyeglasses Order!

Click here to start browsing our store by lens type.

Understanding Your Eyeglasses Prescription

On your eyeglasses prescription, there should be two sets of numbers:

  • Left Eye (OS)
  • Right Eye (OD)

Sometimes numbers are (+) or (-), as well an “axis” number (x).

Below is an example of an eyeglasses prescription for astigmatism:

Left Eye (OS) -2.50 -1.00 x180
Right Eye (OD) +1.00 -0.50 x25

The first number is SPH, which can be (+) or (-).
The second number is CYL, which can also be (+) or (-).
The third number is an axis and has no (+) or (-).

Below is an example of an eyeglasses prescription without astigmatism:

Left Eye (OS) +1.50
Right Eye (OD) +1.00

How long does an eyeglasses prescription last?

An eyeglasses prescription’s length of validity typically depends on the age of the person that wears prescription eyeglasses.

For instance, when children are growing, their eyes are also growing, and they are more susceptible to rapid changes. So when they go through a sudden growth spurt, changes in the eyes are likely to be more dramatic.

As people reach adulthood, their eyeglasses prescriptions will typically stabilize as they reach their 40s, which is when changes short-distance vision begin.

OpDocs believes everyone should have an annual eye examination. If you have an illness such as diabetes, more frequent exams may be needed and should be determined by your eye care professional. Until stabilized, glaucoma patients could be seen weekly for a period of time.

Always ask your examining doctor when you need to be seen again. Most will send a reminder that it’s time to make an appointment.