Which statement about preservative usage is true?

Which statement about preservative usage is true?

• A. Preservatives include chlorhexidine/PAPB, polyquad, and polyhexanide
• B. All products use polyquad
• C. No preservative is used in these products
• D. All products use chlorhexidine/PAPB

Answer: (A)

Preservatives in lens care products are used to keep solutions from growing microbes between uses. The statement is true because several preservatives are commonly used in gas-permeable lens care, including chlorhexidine with PAPB, polyquad, and polyhexanide. Each of these antimicrobial agents serves to protect the disinfection and cleaning process, and different products may rely on different preservatives or even be preservative-free for sensitive eyes. So while one product might use polyquad, another might use PHMB or chlorhexidine/PAPB, and others may be preservative-free. The other options don’t fit because not all products use polyquad, not every product is preservative-free, and not all products rely on chlorhexidine/PAPB.

Preservatives in lens care products are used to keep solutions from growing microbes between uses. The statement is true because several preservatives are commonly used in gas-permeable lens care, including chlorhexidine with PAPB, polyquad, and polyhexanide. Each of these antimicrobial agents serves to protect the disinfection and cleaning process, and different products may rely on different preservatives or even be preservative-free for sensitive eyes. So while one product might use polyquad, another might use PHMB or chlorhexidine/PAPB, and others may be preservative-free.

The other options don’t fit because not all products use polyquad, not every product is preservative-free, and not all products rely on chlorhexidine/PAPB.