FRAME WITH PRESCRIPTION RESTRICTION. Due to the design of this frame, we have to restrict the prescriptions available. We are unable to produce over -/+3 powered prescriptions. Trendy and modern, London Retro Balham is a bold design. The sleek acetate of the frame forms a contemporary square silhouette, while sprung hinges provide a bespoke fit ideal for any environment. The metal bar along the temples is a sleek, signature finish that perfectly emphasises this fashionable design.