These Nike sports sunglasses are designed to take either a prescription insert or direct fitting lenses. The optical adaptor is designed to fit securely into the frame as an alternative to wearing contact lenses. If either of these options are required click on the 'Prescription available' icon and select the  prescription package  you need. Once selected, your prescription will be incorporated into your selected eyewear. Run by qualified opticians, and as part of our customer care process, all eyewear are tested by eyekit to ensure they meet the correct UV rating and your exact prescription before being dispatched.