Not sure Specsavers are reasonable with their customers. You will ALWAYS need replacements. How amazing - apparently a slight adjustment to your prescription! Haha!! Great sales idea.!! Its the way they operate because The glasses have poor quality lens and lose visibility and Impossible to clean! Last visit, I suggested they were wrong. Found out the sight line was inaccurate. Finally went back as still not correct but told they absolutely matched my prescription and had been checked. Specs still not right and never have been. Poor lens quality and now a hinge which I reverted to using super glue. Rubbish product!