Your prescription uses a few abbreviations. Here is what each one means and how to enter it on a Specsly product page.
| Term | Meaning |
|---|---|
| OD | Right eye (oculus dexter) |
| OS | Left eye (oculus sinister) |
| SPH (sphere) | Lens power in dioptres. Minus is short-sighted, plus is long-sighted. |
| CYL (cylinder) | Extra power for astigmatism. Blank or “DS” means none. |
| AXIS | The angle of the astigmatism correction, from 1 to 180. Only used when there is a CYL value. |
| ADD | Additional magnifying power for progressive lenses and readers. |
| PD | Pupillary distance. See how to measure your PD. |
| Prism | Corrects eye alignment. We cannot make prism lenses online yet, so please contact us first. |
Tips
- Use a prescription issued within the last two years.
- Contact lens prescriptions are different from glasses prescriptions and cannot be used for glasses.
- Not sure about a value? Choose “Send it after checkout” and we will check it with you.