The most common mistake we see is the incorrect entry of the '+' and '-' values for SPH and CYL. This is an issue that is often caused by customers entering their prescription incorrectly.

If you feel you have a problem seeing with your new glasses, please ensure you have entered your values correctly. If you notice an error please contact us immediately with a copy of your prescription from your opticians so we can verify where the error lies for you.

Please also ensure you provide details of how you obtained your Pupillary Distance - PD measurement in order to remedy any issues.