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What Is Samfilcon A and What Makes It Different from Other Monthly Lens Materials?
Bausch + Lomb Ultra is made from Samfilcon A — a silicone hydrogel developed by Bausch + Lomb specifically for the Ultra monthly lens.
Key Properties of Samfilcon A
| Property | Value |
|---|---|
| Water Content | 46% |
| Dk/t | 114 |
| Diameter | 14.2 mm |
| Base Curve | 8.5 mm |
| UV Protection | No |
How Samfilcon A Compares to Other Monthly Materials
| Material | Lens | Dk/t | Water Content |
|---|---|---|---|
| Comfilcon A (CooperVision) | Biofinity | 160 | 48% |
| Senofilcon C (Johnson & Johnson) | Acuvue Vita | 147 | 41% |
| Samfilcon A (Bausch + Lomb) | B+L Ultra | 114 | 46% |
What Makes Samfilcon A Different
The key differentiator of Samfilcon A is the MoistureSeal® Technology integration. High molecular weight PVP is incorporated throughout the Samfilcon A matrix during manufacture — creating a lens where moisture-retaining properties are built into the material itself rather than applied as a surface treatment. This gives Bausch + Lomb Ultra lenses their specific comfort profile: consistent intra-day hydration measured at 95% retention for up to 16 hours. The moderate 46% water content is also moisture-stable — less likely to deplete the tear film to maintain its own hydration than higher-water-content lenses.
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