What preservative is used in Clean?

• A. Polyquad
• B. Chlorhexidine/PAPB
• C. Polyhexanide
• D. Povidone iodine

Answer: (C)

Preservatives in lens cleaning solutions are chosen to keep the bottle sterile while staying safe for the eye and compatible with lens materials. Clean uses polyhexanide (PHMB) as its preservative. PHMB provides broad-spectrum antimicrobial activity at low concentrations and tends to be gentle on the ocular surface and compatible with gas-permeable lens materials, reducing the risk of corneal irritation or staining with regular use. Other options like polyquad are used in different solutions, chlorhexidine-based systems exist in some products, and povidone-iodine is primarily an antiseptic used in clinical settings rather than a daily preservative in lens care. So, the preservative used in Clean is polyhexanide.