Rigid gas permeable contacts, also called GP or RGP lenses, have many advantages beyond healthy oxygen flow. RGPs lenses have helped slow down the development of nearsightedness in young and adult lens wearers. Generally, the advantages of GP hard contact lenses outnumber the disadvantages.oday’s contact lens wearers have several options, which is fantastic but also confusing. Knowing which contact lenses are right for you means understanding the different contact lens options available. Think about your lifestyle and your vision needs as you read about the variety of contact lenses available.