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What Is Stenfilcon A and What Makes It Different from Other Silicone Hydrogel Materials?
CooperVision MyDay is made from Stenfilcon A — a proprietary silicone hydrogel developed specifically for the MyDay daily disposable. Understanding Stenfilcon A explains how MyDay achieves its combination of high oxygen transmissibility and natural, coating-free comfort.
Key Properties of Stenfilcon A
| Property | Value |
|---|---|
| Water Content | 54% |
| Dk/t | 100 |
| Diameter | 14.2 mm |
| Base Curve | 8.4 mm |
| UV Protection | Class 2 (~85% UVA / ~96% UVB) |
How Stenfilcon A Delivers Oxygen
Stenfilcon A's silicone structure allows oxygen to pass through the lens matrix directly — independent of water content. This gives MyDay a Dk/t of 100 — approximately four times the oxygen transmissibility of a typical standard hydrogel daily lens.
Stenfilcon A vs Other CooperVision Daily Materials
| Material | Lens | Dk/t | Water Content |
|---|---|---|---|
| Stenfilcon A | MyDay | 100 | 54% |
| Stenfilcon A | Clariti 1 Day | 86 | 56% |
Both use Aquaform® Technology. Stenfilcon A in MyDay achieves a higher Dk/t, making it the higher-performance option for wearers with elevated oxygen requirements. Smart Silicone™ technology modifies the silicone components at the molecular level to make them inherently water-compatible — rather than masking surface hydrophobicity with a coating.
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