Which list includes all GP lens materials mentioned?

Which list includes all GP lens materials mentioned?

• A. PMMA, silicone/acrylate, fluoro-silicone/acrylate
• B. PMMA only
• C. Silicone/acrylate only
• D. Fluoro-silicone/acrylate only

Answer: (A)

GP lens materials span three families: PMMA; silicone/acrylate; and fluoro-silicone/acrylate. PMMA is the traditional rigid material used in early gas-permeable lenses, important to recognize even though it isn’t highly oxygen-permeable on its own. Modern GP lenses rely on silicone/acrylate and fluoro-silicone/acrylate, which provide higher oxygen permeability to keep the cornea healthier and allow more flexible lens designs. So, the best choice lists all three material types mentioned. Any option that leaves out one of these families would be incomplete because it wouldn’t reflect all GP lens materials discussed.

GP lens materials span three families: PMMA; silicone/acrylate; and fluoro-silicone/acrylate. PMMA is the traditional rigid material used in early gas-permeable lenses, important to recognize even though it isn’t highly oxygen-permeable on its own. Modern GP lenses rely on silicone/acrylate and fluoro-silicone/acrylate, which provide higher oxygen permeability to keep the cornea healthier and allow more flexible lens designs.

So, the best choice lists all three material types mentioned. Any option that leaves out one of these families would be incomplete because it wouldn’t reflect all GP lens materials discussed.