Understanding your eyeglasses prescription

Before placing an order, you need to get a prescription from your optician or optometrist.

The prescription has the following main attributes:

Sphere (SPH):


Example 1


Example 2

Cylinder (CYL):


Example 1


Example 2

Axis (CYL):


Example 1


Example 2


There are several ways of writing an eyeglasses prescription.130718_sample_rx_help-01

  • For example, in sample 2 in the example below, the doctors has left out the decimal point.
  • In sample 3, both the near and distance vision Rx are printed in the table hence eliminating the need for an ADD column.
  • The ADD column in Sample 3 is calculated by subtracting DISTANCE SPHERE from NEAR SPHERE. e.g. the RIGHT ADD is: +0.75 – (-1.50) = +2.25 and LEFT ADD is: +1.00 – (-1.25) = +2.25
  • (O.D) refers to the right eye and (O.S) refers to the left eye. SPH, CYL, AXIS , PRISM , ADD are important attributes of a prescription
  • Enter your prescription in the online order form exactly as you see it in the prescription table. Blank value should be left blank in the form and care should be taken with +/ – Signs. Corresponding SPH, CYL , AXIS and ADD values should be entered correctly.


Pupillary Distance

The Pupillary Distance or PD is required to position the lens correctly in relation to the center of the pupils.In addition to your prescription, you might need the pupillary distance especially If your prescription does not have it. You may contact your local optician or measure it yourself.

We can calculate your PD with credit card

Email us a picture while holding the back side of a credit card ( Same size shopping card will do) on your forehead using your webcam or phone and we will calculate send you an accurate PD.

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How do I get my eyeglasses prescription?

You can visit your local optometrist/Eye Doctor/Optician who is legally required you to give you your eyeglasses prescription after conducting an eye exam. Make sure to ask them a copy of your prescription when you visit them next, also ask them to write your pupillary distance.

How old can my prescription be?

It refers from person to person and factors such as age and health can be counted in. Ideally, your prescription should not be more than two years old. Please refer to the table below that contains information on how often you should get your eyes tested:


How often should you get an eye exam?

Under seven years old Every six months
Seven to 16 years old Every year
16 to 59 years old Every two years
60 to 69 years old Usually every two years, but sometimes every year
Over 70 years old Every year


How often should you get an eye exam

If you are diabetic Every year
If you or a member of your family has glaucoma Every year


An eye exam is one of the simplest appointments to make and the process does not take more than 15 minutes. So, we highly recommend that if your prescription is more than 2 years old, then you must visit your optician to get a new one unless you are extremely confident that your prescription has not changed.