Are contact lenses really safe? 👁️

They are small, invisible once worn, and admired for their practicality. However, contact lenses raise questions regarding their safety. What are these thin membranes placed on our eyes really hiding?

In an in-depth investigation conducted in France, the journal 60 Millions de consommateurs reveals the presence of chemical substances and microplastics within these ocular devices. Among the findings, 241 compounds classified as "extremely concerning," including titanium dioxide and bisphenol A, which are often cited for their harmful health effects.


The investigations also highlighted the emission of microplastics by contact lenses. These particles, released during usage, sometimes include silicone, a common material in soft hydrogel lenses. The tested products, purchased either in stores or online, were not exempt from this finding.

On the other hand, some concerns were ruled out: the six targeted PFAS, pollutants nicknamed "forever chemicals," were not detected in simulated tear liquid. Similarly, no migration of SVHC substances into tears was demonstrated at this stage.

Nevertheless, current research leaves many questions unanswered. Manufacturers, citing trade secrets, do not disclose the exact composition of their lenses. This lack of transparency complicates the assessment of risks to ocular and systemic health.

Additional areas of concern involve colored lenses or those equipped with UV filters, where nanometric titanium dioxide has been identified. Classified as potentially carcinogenic, this compound raises questions about its usage in direct contact with the eyes.

Beyond health-related issues, the environmental impact of lenses also draws attention. Their degradation generates thousands of microplastic particles per gram. Improper disposal of these products poses a threat to aquatic wildlife. It is therefore important to dispose of used lenses in household waste, not down the drain.

Despite these findings, the precise risks to users remain difficult to ascertain. The investigation calls for caution and advocates for more in-depth studies to better understand the long-term impacts of the detected materials and particles.

In the meantime, experts emphasize the importance of rigorous hygiene to minimize infectious risks associated with lens use, as well as a thoughtful selection of cleaning products.

Why is titanium dioxide problematic in contact lenses?

Titanium dioxide, used in some contact lenses for coloring or UV filtration, is classified as carcinogenic in its nanometric form by the European Union. Its toxicity is linked to its ability to induce oxidative stress in cells.

When present in lenses, it may migrate into tear fluid, although studies have not yet demonstrated significant migration. However, prolonged exposure could pose risks, particularly through direct contact with ocular tissues.

This compound also raises environmental concerns. Improperly disposed lenses release titanium dioxide into aquatic ecosystems, posing threats to wildlife.

Further research is needed to better understand the risks, both for human health and for the environment.