1. Using the app, sync your phone with your computer. Then, use your phone to scan the lenses of your glasses.

2. After a few magical moves, we’ll identify your prescription values and save them to your online account.

3. Use your newly-discovered prescription to go forth and shop new glasses — it’s that simple.

This tool is handy for most single vision glasses wearers and means you don’t need to get an eye test before you find yourself some new specs.

1. Have a prescription outside -6.00 and +3.00 dioptres, or a cylinder above -2.50.

2. Have glasses that are two years old or more.

3. Wear varifocal glasses.