Which statement about combination agents for GP lenses is correct?

• A. All combination agents can be used in the eye
• B. No combination agents can be used in GP care
• C. Some combination agents can be used in the eye
• D. They must be used with a physician's instruction

Answer: (C)

Gas permeable lens care relies on using solutions that are compatible with the lens material and safe for the eye. Combination or multipurpose agents are formulated for different lens types, and only some are specifically labeled as safe for hard or rigid gas-permeable lenses. When a combination agent is approved for GP lenses, it has been tested to avoid leaving residues, altering the lens surface, or irritating the cornea, and it can be used with GP lenses as directed by the manufacturer. Many combination agents are designed for soft lenses and should not be used with GP lenses because they may cause deposits or discomfort. So, the best statement is that some combination agents can be used in the eye with GP lenses—those that are explicitly approved for GP use and used according to the product’s instructions. Always follow the lens manufacturer’s and clinician’s guidelines when selecting and using these solutions.