The sphere indicates the strength of the lenses. Before the value stands a plus if you are farsighted, or a minus if you are nearsighted. Please pay careful attention to the symbol when placing your order. Should there be no symbol, typically this indicates a plus value.
Pupillary distance (PD)
The pupillary distance describes the respective positioning between the middel point of your pupil and the middle of your nose's bridge. This will typically be given separate for the right and left eye, and are typically between 25 and 38mm. In many cases this value is also noted as a single number between 50 and 76 mm. Here you can take for your order half of this value for each respective eye (for example, a given value of 60 mm would indicate a distance of 30 mm for both the right and left eyes).
Cylinder (ZYL/ CYL) – Only relevant for those with corneal irregularities
The cylinder indicates the height of the corneal curvature. Please be aware of the preceding symbols during your order. Should no symbol be given, typically this indicates a plus-value.
Axis (A/ACH) – Only relevant for those with corneal irregularities
The axis is expressed in degrees and describes the orientation of the required cylinders for correction of corneal irregularity. It is required in order to be able to properly align your lenses. The axis is always between 0° and 180°.
Addition (ADD) – Only relevant for varifocal glasses
The addition (supplement) describes the strength of your lenses that, in addition to the distance correction, need to assist with seeing in close proximity; for example, when reading. This value is always positive and is most often identical in both eyes. As a result, it is commonly only given once.
Tip for multifocal lenses: Please be aware, that the values for multifocal glasses vary for every frame. As a result, it is especially important that the alignment values are measured directly for your frames. We recommend that before purchasing you order the desired frames to try at home free for 10 days.
Tip for contact lenses: Unfortunately it is not possible to directly carry over your glasses values to contact lenses. This is because the lenses lie directly on your cornea while glasses maintain a distance from your eyes. As a result, contact lenses should always be fit with the individual assistance of an optician.