help-prescription-values

Your prescription contains all (or almost all) data that we need, and here comes a little help how to read it:

The first line is always the correction for the right eye and the second line is for the left eye.

Every prescription has at minimum a Spherical (SPH) power (but this can also be zero if your prescription has additional values). The 'power' of the prescribed correction is measured in Diopters in 0.25 steps. Your SPH value must have a + or – symbol in front of the number, depending if your eyes are primarily far-sighted or near-sighted. Pay special attention to enter this correctly, since +2.00 is exactly the opposite of -2.00 as the values suggest.

Your prescription may contain a Cylinder (CYL) value, also measured in + or - Diopters, depending if you have a condition called 'astigmatism'. If you do not have a CYL value your eyes are round like a basketball, however most eyes are shaped like a football therefore a CYL correction is needed to make your glasses perfect. If you have a CYL on your prescription, you will also find an Axis (AX) value next to it, that is the angle of the CYL, measured in degrees with values between 0 and 180.

Finally, you may find Addition (ADD) value on your prescription – you will only need this if you order multifocal lenses. Addition is also prescribed in Diopters in 0.25 steps and describes the difference between your distance and near vision correction. This data does not contain a + or – symbol since it is always a positive value.

Rare and complicated prescriptions may contain some other data – if you are unsure of their meaning, contact our expert team and they will be happy to help you.