What is an essential characteristic of an ideal wetting solution?

An essential characteristic of an ideal wetting solution is that it should be suitable for direct instillation into the eye. This quality ensures that the solution is safe and comfortable for use on the ocular surface, minimizing potential irritation or adverse reactions when placed directly in the eye. A wetting solution designed for this purpose must meet specific safety standards, particularly in terms of pH and osmolarity, to be compatible with the natural tear film and not cause harm or discomfort.

While enhancing lens clarity, not altering lens parameters, and containing preservatives may seem important, they are secondary characteristics compared to the critical need for safety in ocular applications. Ensuring that a wetting solution can be directly instilled into the eye is a fundamental requirement for its acceptability as a product used in conjunction with contact lenses.