GLASSES OR CONTACT LENS REFUNDS
If you have already used a voucher towards the cost of your glasses or lenses you cannot get a refund, unless it was only a 'complex lens' voucher. Nor can you claim a refund of the difference between the voucher value and the actual cost of your glasses or lenses, even if they cost more that the voucher value.
If you want to claim a refund, ask the person who supplies your glasses or contact lenses for a receipt which shows how much you paid and the date of payment. Complete an HC5 refund form and make sure you enclose your optical prescription and your receipt with your HC5 when you send it off. The form tells you what to do. The maximum refund you can get back will be the voucher value which matches your prescription.