Can the preservatives sorbic acid and EDTA (ingredients of Clerz rewetting drops) damage the lens surface of Night&Day contact lenses?

There is no evidence that these preservatives can damage or alter the surface of Focus Night & Day lenses. Like all other lenses, preservatives may be adsorbed particularly if the surface is hydrophobic and thus release of these agents may result in discomfort and allergic reactions.

Clerz drops have been used successfully in clinical trials and as far as we know there have not been any reports of complications.