How does Surface Active Technology™ in Biotrue ONEday maintain 98% lens moisture for 16 hours?

How Does Surface Active Technology™ in Biotrue ONEday Maintain 98% Lens Moisture for 16 Hours?

Surface Active Technology™ is the dehydration-resistance mechanism built into Bausch + Lomb Biotrue ONEday daily contact lenses — the engineering behind the ability to maintain 98% of lens moisture for up to 16 hours.

The Challenge: Lens Dehydration During Daily Wear

All contact lenses lose some moisture during the wear day as the tear film evaporates. For Biotrue ONEday — made from Nesofilcon A (HyperGel) with a high water content of 78% — managing dehydration is especially important: a high water content lens has more moisture to potentially lose. Surface Active Technology™ is specifically designed to lock in that moisture throughout the full daily wear period.

How Surface Active Technology™ Works

Surface Active Technology™ creates a dehydration barrier on the lens surface. A surface-active agent aligns at the interface between the lens surface and the tear film, creating a hydrophilic (water-attracting) outer layer that resists the evaporative forces that would otherwise cause the lens surface to dry. Rather than simply making the surface wettable, Surface Active Technology™ actively resists dehydration — addressing the mechanism of moisture loss rather than compensating for it after it occurs.

Why 78% Water Content Requires This Technology

The HyperGel material (Nesofilcon A) mirrors the natural moisture content of the corneal epithelium — approximately 78% water. This creates an interface that is naturally compatible with the eye's own biology. However, maintaining this high water content across 16 hours of wear requires the active dehydration resistance that Surface Active Technology™ provides, resulting in a lens that delivers the soft, hydrated feel of a naturally moisture-rich material throughout the full daily wear period.