Eye doctors (opticians) test your sight and recommend glasses or contact lenses. A HC2 certificate allows you to get free NHS sight tests. Look for an optician displaying a sign, which says that they give NHS sight tests. If you need glasses, the optician will give you a NHS voucher, which you can use to buy either glasses or contact lenses. Ask your optician for details.
Details of opticians in our area can be found on the NHS website