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Most soft contact lenses are sufficiently permeable to maintain good eye health but not all hard contact lenses are permeable enough to allow for sufficient oxygen levels to reach the cornea. In the 1970s, a hard contact lens constructed of plastic mixed with silicone was introduced. This new contact lens was still hard but the use of silicone allowed for oxygen to penetrate the eye. These rigid gas permeable (RGP) contacts allowed those who were not candidates for soft contact lenses to enjoy eye correction without risking oxygen deprivation to the eye.