Lennon was wearing the best shape for high prescriptions. Small, and round. Both will make the highest prescriptions very thin since the flaring out of the le

Lennon was wearing the best shape for high prescriptions. Small, and round. Both will make the highest prescriptions very thin since the flaring out of the lens doesn't happen. Most of the mainstream optometrists don't specialize in frames like these. Lenses are also available in 1.7+ high index in plastic lenses or even higher if you don't mind glass. Glass lenses while brittle at high index, can be additionally hardened as well. It's helpful to find a frame manufacturer that can hide higher prescriptions in the thickness of the frame. Companies like OGI, Anne Et Valentin have suitable frames for high prescriptions, which include adjustable nosepads to get the lenses right, and also a hybrid frame where the lenses might be wrapped in a combination of metal and plastic.