How do I Read My Glasses Prescription?

Reading your vision prescription might seem to be complicated but for example it is much easier to read than a medical prescription. The following are some tips on understanding your eyewear prescription. If you’re unsure of anything call our Customer Support team at  +372 57873273 or through our Live Chat.  We can also contact your Eye Care Provider to check your prescription on your behalf.

Example of prescription

Match the numbers to prescription fields on our website

What do the numbers mean on my prescription?

Sphere indicates the amount of lens power, measured in diopetrs(D), prescribed to correct nearsightedness or farsightedness

Cylinder indicates the amount of lens power for astigmatism, if nothing appears in your prescription, either you have no astigmatism or it is so slight that it is not necessary to correct it with your lenses

The axis number on your prescription tells in which direction they must position any cylindrical power in your lenses (required for people with astigmatism or in short, CYL)

ADD, is the additional corrections required for reading. Sometimes NEAR is used instead of ADD.

OS – Means left eye. (oculus sinister)
OD – Means right eye. (oculus dextrus)

Pupillary distance (PD)  is the distance measured in millimeters between the centers of the pupils of the eyes. This measurement is is used to determine where you look through the lenses of your glasses. The average adult’s PD is between 54-74 mm.  Kids are between 43-58 mm. Eye doctor will usually measure your PD during an eye exam.

This means short viewing distance prescription.

This means long viewing distance prescription.


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