Guide
Prescription guide
Your prescription tells us exactly how to make your lenses. Here's how to read it, measure your PD, and send it over.
How to read your prescription
Your prescription lists a row for each eye. The abbreviations below are the ones you'll see most often.
- OD
- Right eye (oculus dexter).
- OS
- Left eye (oculus sinister).
- SPH
- Sphere: the lens power that corrects short or long sightedness. A minus value is short sighted, a plus value is long sighted.
- CYL
- Cylinder: the amount of correction for astigmatism. It may be blank if you don't have any.
- AXIS
- The angle from 1 to 180 that tells us where to place the cylinder correction.
- ADD
- The added magnifying power for reading, used for progressive and reading lenses.
- PD
- Pupillary distance: the space between your pupils in millimetres, so we can centre your lenses.
- PRISM
- A less common correction for eye alignment. Include it only if it appears on your prescription.
Finding your PD (pupillary distance)
PD is the distance in millimetres between the centres of your pupils, and it lets us centre your lenses correctly. It is often written on your prescription. If it isn't, ask your optician, or measure it at home: stand about 20cm from a mirror, hold a ruler across your brow, and read the millimetre mark from the centre of one pupil to the centre of the other. An adult PD is usually between 54 and 74mm.
How to send us your prescription
RIght now the best way is to go to "choose lenses" and type the values into the prescription fields.