Which of the following is not a preservative used in contact lens solutions?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

Which of the following is not a preservative used in contact lens solutions?

Explanation:
Preservatives in contact lens solutions are antimicrobials added to prevent microbial growth in the bottle and on lenses. Pseudomonas is a genus of bacteria, not a preservative, so it doesn’t serve to prevent growth. The other items are substances used to inhibit microbes or support preservation: Polyquad is a polymeric quaternary ammonium preservative; benzalkonium chloride is a classic preservative; edetate disodium is a chelating agent that helps stabilize the solution and can enhance preservative effectiveness, though it is not an antimicrobial on its own. So the non-preservative in the list is Pseudomonas.

Preservatives in contact lens solutions are antimicrobials added to prevent microbial growth in the bottle and on lenses. Pseudomonas is a genus of bacteria, not a preservative, so it doesn’t serve to prevent growth. The other items are substances used to inhibit microbes or support preservation: Polyquad is a polymeric quaternary ammonium preservative; benzalkonium chloride is a classic preservative; edetate disodium is a chelating agent that helps stabilize the solution and can enhance preservative effectiveness, though it is not an antimicrobial on its own. So the non-preservative in the list is Pseudomonas.

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