Clinical evidence
Measured, not marketed. Every Clearlii claim is grounded in independent testing and peer-reviewed studies—so you can recommend with confidence.
of participants rated comfort "excellent" or "very good" in multicenter studies
more oxygen to the cornea with silicone hydrogel vs. traditional hydrogel
performance metrics verified by independent laboratories
Clinically proven, professionally trusted
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Evidence from every angle
Multicenter studies confirm Clearlii's superior moisture retention and comfort across diverse wearer groups.
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Measured, not marketed
From oxygen permeability to tear-film stability, every metric is verified by independent labs to ISO standards.
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Trusted in daily practice
Hundreds of opticians across the Nordics recommend Clearlii for its proven, repeatable performance.
Measured, not marketed
Behind every Clearlii comfort claim sits a body of evidence: multicenter clinical studies, independent laboratory measurement and peer-reviewed literature. We publish the parameters that matter to clinicians—oxygen transmissibility, water content, wettability and tear-film stability—and reference our sources.
This page summarises the evidence base for the Professional series. For full study documentation, registered practitioners can request the complete data pack.
- Multicenter clinical comfort studies
- Independent lab verification of Dk/t and water content
- Peer-reviewed references for HA, vitamins and edge design
The evidence in numbers
Download the evidence
Spec sheets and study summaries for practitioners and informed wearers.
Evidence, answered
How can I access the full study data?
Registered eye-care professionals can request complete study documentation and references through our partnerships team or your Clearlii account manager.
Are the comfort figures independent?
Comfort ratings come from clinical studies with real wearers; physical parameters such as oxygen transmissibility and water content are verified by independent laboratories to ISO standards.
Do you provide references for the vitamin and HA claims?
Yes. Our literature pack cites the peer-reviewed sources behind the hyaluronic-acid and vitamin-enrichment claims so you can evaluate them directly.
Put the evidence to work
Order trial packs, access the full data and get fitting support for your practice.