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How to properly understand your prescription?

If you are not sure about what is written on your prescription, don’t worry, we will help you! Below you can find the description and explanation for the items that can appear on your prescription.

Prescription for glasses

Information on your prescription

Do you want to order glasses online? Then, understanding your prescription can be very handy.


This is why our team at Blueberry Optic has prepared a short guide to help you understand your prescription correctly so that you can order your glasses without worries.

In case you won’t be able to properly read the data on your prescription or if you don’t understand it, write to us and we will gladly help you out.

Example of a prescription for a patient with astigmatism.

50 zł RABATU NA OKULARY DO 31.07.2024r
KOD "okulary50"



Basic items on your prescription


(farsighted) -

Farsighted (in Polish, “Dal”) means your glasses are aimed for everyday use. They will allow you to see well at longer distances, e.g. for driving a car, watching TV.


(nearshighted) -

Nearshighted (in Polish, “Bliż”) means your glasses are aimed at for close range. They will allow you to see better at closer distances, e.g. for reading a book.


(OD /  OS) -

OD (or right eye. In Polish, “OP” or “oko prawe”) / OS (or left eye. In Polish, “OL” or “oko lewe”)


(sphere) -

Indicates the amount of lens power. It can have positive or negative values or even zero. Lenses with sphere equals to zero are known in Poland as “zerówki”.

PD -

Means pupillary distance and it is the distance from the center of the pupil to the center of the nose. It is usually different for each eye. It can be given for each eye separately or as a sum if the face is symmetrical and the pupillary distances to the nose are identical.


The data above is required for proper preparation of your glasses. The remaining fields below, such as cylinder, axis, prism, and base, refer to patients with more complex eye defects, e.g. astigmatism.

Additional fields on your prescription

Cylinder -

This value means that astigmatism correction is required. It can be positive "+" or negative "-", and it always comes together with Axis data (see below).

(axis) -

Used together with the Cylinder value, its range is from 0 to 180 degrees. It is essential for the correct positioning of the lenses in the frame.


(prism) -

Parameter given by ophthalmologists / optometrists in the case of strabismus or problems with binocular vision of the patient. Values are given in diopter and it always comes together with "base" data (see below).


(base) -

It is an indication of the direction of the prism.

If you are still not sure how to read and fill to send your prescription to us, feel free to write to us.

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