What disinfection and care system allows for overnight soaking of GP lenses to achieve disinfection?

• A. Disinfectants
• B. Wetting solutions
• C. Enzymatic cleaners
• D. Saline

Answer: (A)

Disinfection systems for gas permeable lenses rely on a chemical that destroys microbes during soaking. Overnight disinfection is a hallmark of peroxide-based systems, where hydrogen peroxide in the solution does the disinfection and is neutralized in the case before wear. This allows thorough cleaning and disinfection while you sleep. Wetting solutions simply moisten the lens and carry lubrication; they don't disinfect. Enzymatic cleaners address protein buildup but aren't disinfectants themselves, and saline is used for rinsing or storing lenses but does not disinfect. So the option that covers disinfection with an overnight soak is the disinfection-based system.