What is one mechanism by which disinfectants work in GP lens care products?

• A. They use preservatives
• B. They change the lens material
• C. They require heating the lens before use
• D. They repair micro-scratches on the lens

Answer: (A)

Disinfection in GP lens care products often relies on antimicrobial preservatives added to the solution. These preservatives stay in the solution and help prevent microbial growth, protecting both the lens and the eye from contamination as you store, handle, and wear the lenses. They work by interfering with microbial cells—disrupting membranes, inhibiting essential enzymes, or otherwise hindering metabolism—so that bacteria, fungi, or algae don’t multiply.

This is a common mechanism because it provides ongoing protection during use without requiring special steps like heating. Some GP systems also use peroxide-based disinfection, which works through oxidation rather than preservatives, but many standard disinfecting formulations rely on preservatives for their antimicrobial action. The other options—changing the lens material, heating the lens, or repairing scratches—don’t disinfect.