Cost is £302.
If you have a sight prescription i.e. for specs or lenses, you will need to have a 'script that is less than 12 months old, else another sight test with your optician is required beforehand. In either case, the script will then need faxing to the clinic. If you do go to the optician, download and print off the Class 1 visual acuity regs from the CAA website (safety>medical).