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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.
On this page: Benefits of RGP lenses â¢ Astigmatism, presbyopia, keratoconus â¢ Downside of GP contact lenses. Gas permeable contact lenses are rigid lenses made of durable plastic that transmits oxygen.These lenses also are called GP lenses, rigid gas permeable lenses, RGP lenses and oxygen permeable lenses.GP contact lenses are rigid, but they shouldn't be confused with old-fashioned hard contact lenses, which are now obsolete.as permeable contact lenses offer some outstanding benefits over soft lenses. For one, because GP lenses are made from a firm plastic material, they retain their shape when you blink, which tends to provide sharper vision than pliable soft lenses.