FRAME WITH PRESCRIPTION RESTRICTION Due to the design of these frames we have to restrict the prescriptions available. We are unable to produce over a -/+3 powered prescriptions. Chic, modern and coming with a touch of glam, the London Retro Balham frames are quirky and cat-eyed and effortlessly blend style and comfort. Exclusive acetate is light and understated, while sprung hinges provide a catered fit ideal for any environment.