Hard or rigid gas permeable (RGP) are made of a very strong plastic that transmits oxygen. RGP are smaller in diameter than soft contact lenses, and require a little more adaptation time.

Pros

• They provide a sharper vision especially for the people with high refractive errors.
• They will not dehydrate your eyes.
• They will deliver more oxygen to your eyes.
• They will less likely contain protein deposits from absorbing tears.
• They are easier to handle.
• They last longer than soft contact lenses.

Cons

• Initially, they are not as comfortable as soft contact lenses.
• They require extra care to clean and disinfect.
• They may not the best choice for kids. Kids tend not to be compliant with cleaning and disinfecting of RGP.
• It may take more time to get RGP lenses since are made individually for each patient.