 Post-treatment follow-up measurements of the main outcomes will be conducted 3 months and 12 months after surgery, again, after 4 weeks wash out. A number of additional eye tests will also be performed to collect data for the study at the pre-operative appointment when the baseline measurements are taken and at the post-operative follow-up appointments 3 months and 12 months after the surgery. Other data will be collected from eye tests that are routinely performed pre-operatively and at the post-operative follow-up appointments 1 day, 1 week, 1 month, 3 months, 6 months, and 12 months after their surgery. 