You are purchasing a voucher to have your own frames* glazed with a pair of Plastic React to Light Optical Lenses. A choice of Brown or Grey. Once you have purchased the voucher you can specify on Voucher whether you want Brown or Grey. You can upgrade to Transitions Gen 8 for additional cost. Lenses will change from virtually clear to dark brown or grey in the presence of sunlight. Once you have paid for the lenses, we will advise you how to redeem your voucher. Glasses returned within 2 or 3 working days of receipt. You need to be over 18 to use this service. 14 Day Money Back Guarantee * Excludes Rimless Frame Lenses are made from plastic and are suitable for everyday wear. They are not suitable for sports or industrial safety use.