What does the acronym RGP stand for in contact lens terminology?

What does the acronym RGP stand for in contact lens terminology?

• A. Rigid Glass Permeable
• B. Rigid Gas Permeable
• C. Rigid Gaseous Permeable
• D. Ribbed Gas Permeable

Answer: (B)

Rigid Gas Permeable is the standard expansion. In contact lens terminology, a lens described as rigid has a hard, non-flexible shape that sits on the eye, while gas permeable means the material allows oxygen to pass through to the cornea. This combination gives a stable optical surface with good oxygen transmission, which helps keep the cornea healthy. The other phrases aren’t used to describe these lenses—glass isn’t a material used for contact lenses, “gaseous” isn’t the accepted descriptor, and “ribbed” isn’t a term in lens classification.

Rigid Gas Permeable is the standard expansion. In contact lens terminology, a lens described as rigid has a hard, non-flexible shape that sits on the eye, while gas permeable means the material allows oxygen to pass through to the cornea. This combination gives a stable optical surface with good oxygen transmission, which helps keep the cornea healthy. The other phrases aren’t used to describe these lenses—glass isn’t a material used for contact lenses, “gaseous” isn’t the accepted descriptor, and “ribbed” isn’t a term in lens classification.