For healthcare professionals

We want a world with better outcomes

Preservatives are increasingly recognised as having a negative impact on ocular structures even in concentrations as low as 0.005%¹. Patients with Dry Eye Disease (DED), particularly those who require frequent use of lubricants or other topical therapies, should avoid ocular lubricants that contain Benzalkonium chloride (BAK)².

By developing treatments, providing information, and sharing knowledge with specialists around the world, Théa enable everyone to ‘keep their eyes wide open’, our company message. We’re committed to creating openness and discussion about the key issues in eye care, especially the use of preservatives.

Listen to an expert on preservative free eye care

Professor Harminder Dua, one of the world's leading authorities on the cornea and ocular surface disease explains some of the issues in the videos below:

How can a commonly used ingredient cause a problem?
Just why is bak so damaging
What about ‘disappearing’ preservatives?
  • 1.

    Kaercher T et al. How the most common preservative affects the Meibomium lipid layer. Orbit 1999; 18(2): 89–97

  • 2.

    Gomes JAP et al. TFOS DEWS II Iatrogenic report, Ocul Surf 2017; 15:511–38