Gas Permeable Contact Lenses – Introduction Practice Test

The main idea is how the lens surface interacts with tear film components. Fluoro-silicone/acrylate materials put fluorinated groups into the surface, which lowers surface energy. That makes it harder for proteins and lipids in tears to adhere to the lens, so deposits form less readily. This deposit-resistance helps keep the lens surface cleaner, easier to clean, and can improve comfort over time for hard lenses worn longer or more frequently. Tear film stability and wettability aren’t improved by this chemistry; fluorinated surfaces tend to be more hydrophobic, so wettability and tear breakup may not be enhanced. Oxygen permeability is largely about how easily oxygen passes through the material, and while silicone-containing lenses can have good permeability, the question’s pro here specifically points to deposit resistance as the beneficial effect.