How often should I replace my contact lens case?

The case is often the most contaminated part of any contact-lens setup. Studies repeatedly find that 30–80% of in-use cases have visible bacterial biofilm, and once biofilm establishes, cleaning won't fully remove it.

Case care:

• Empty old solution every morning — never top up.
• Rinse the case with fresh solution (not tap water).
• Wipe the inside with a clean tissue or cotton bud.
• Leave open, lid down, on a clean surface to air-dry.
• Replace every 3 months at minimum.

Many multi-purpose solution bottles include a free case for this reason. If yours doesn't, replacement cases cost a few euros and they are the cheapest infection insurance available.