Which cold disinfection chemical is least likely to cause a reaction when used as directed?

Hydrogen peroxide is a widely used cold disinfection agent that, when used correctly, has a low incidence of adverse reactions compared to other disinfectants listed. It works by breaking down into water and oxygen, which can make it a safer option for contact lens disinfection, especially for those with sensitive eyes or allergies.

When used as directed, hydrogen peroxide effectively disinfects contact lenses without introducing many of the irritants associated with other chemicals, like formaldehyde, which can cause significant allergic reactions and irritation. Isopropyl alcohol and ethyl alcohol, while effective as disinfectants, can also cause dryness and irritation, which may not make them suitable for all users, particularly those with sensitive corneas.

In summary, hydrogen peroxide stands out as a safer choice in cold disinfection, minimizing the likelihood of reactions when used properly.