It can sometimes take a bit of time to fully adapt to a new prescription and this is totally normal. Make sure to give your eyes the best chance to adapt to your new glasses by persevering with the new prescription. Try to wear your new glasses full time for at least 7 days for Single Vision, and 14 days for Varifocal lenses without swapping back to an old pair.
If you are having ongoing issues with your new glasses, please give us an email at help@iolla.com or pop in to one of our showrooms and we can investigate this further. We would never see a customer stuck with glasses they aren't getting on with.