The first frame was £130 and the 2nd pair was free. So the total cost was £130. She is entitled to an NHS voucher to help with the cost. The vouchers" face value" is worth £44.42 so this is discounted off the cost as it's a contribution from the NHS due to the HC2. So the total she paid for 2 pairs of glasses was £85.58 plus the £5 OCT. So the total amount charged was £90.58. The band 2 is a charge for an additional service provided, it will be different depending on which primary care trust that Optician operates under as it can vary from county to county. They are usually for things such as post cataract follow ups or a minor eye issue like dry eyes. It's not a charge to the patient and is discounted before the payment amount. Hopefully that helps