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Ground-penetrating radar (GPR) is a geophysical method that uses radar pulses to image the subsurface. This nondestructive method uses electromagnetic radiation in the microwave band (UHF / VHF frequencies) of the radio spectrum, and detects the reflected signals from subsurface structures.
GP contact lenses are also known as rigid gas permeables, or RGPs. Your eye doctor may call them GPs or RGPs. GP contacts are made of a firm, durable plastic that transmits oxygen.