how do you enter your prescription?_

If you’ve used contact lenses before, it’s really easy.

You will find your lens prescription on the side of the contact lens box. On our contact lens boxes the prescription information will look like this:

If you only have the prescription form that your optician or optometrist gave you, look for the same values on there.

On both the prescription form and the lens case, the acronyms used to indicate the prescription mean the same thing:

Sphere (PWR/SPH)

All prescriptions are expressed in dioptres, always accompanied by the symbol for myopia (-) or for hyperopia (+).

Base Curve (BC)

This tells us the base curve that your contact lenses require in order to fit your eyes. It’s usually between 8.3 and 9.0 mm.

DIA (ø)

This figure gives us the diameter of the lens in millimetres. This figure indicates the size of the lens. If the diameter of the lenses is incorrect, this can cause discomfort and irritation.

Cylinder (CP/CYL):

This is a parameter on an optical prescription whose value in dioptres refers to the level of astigmatism.


Indicates the position of the astigmatism in degrees.


Addition: This is the difference between the distance-vision dioptres and the near-vision dioptres, a value that is essential for progressive lenses.

  • Daily multifocal contact lenses: Low Addition (up to +2.25) and High Addition (from +2.50 to +3.00).
  • Monthly multifocal contact lenses: Addition values of +1.00, +1.50, +2.00 and +2.50

Design: the dominance of the eye.

  • N: non-dominant eye.
  • D: dominant eye.