What is HyperGel material in Biotrue ONEday and how does 78% water content affect wear?

What Is HyperGel Material in Biotrue ONEday and How Does 78% Water Content Affect Wear?

HyperGel is the trademarked name for the Nesofilcon A material used in Biotrue ONEday — and 78% water content is its defining characteristic.

What Is HyperGel?

HyperGel (Nesofilcon A) is a non-ionic hydrogel material developed by Bausch + Lomb. The 78% water content is significantly higher than most other daily disposable lens materials:

Why 78% Water Content?

Biotrue ONEday is bio-inspired: the lens water content is specifically formulated to mirror the natural water content of the healthy corneal epithelium — approximately 78% water. This creates a lens-to-eye interface that is naturally compatible with the eye's own biology: softer, more comfortable, and more closely matched to the ocular surface it sits on.

Trade-Off: Oxygen

The high water content comes with a trade-off in oxygen transmissibility. Biotrue ONEday has a Dk/t of 42 — lower than silicone hydrogel daily lenses (MyDay Dk/t 100, Dailies Total1 Dk/t 127). For daily wear up to 16 hours, Dk/t 42 is generally sufficient for most wearers — but may not be suitable for those with elevated corneal oxygen requirements. Surface Active Technology™ addresses the dehydration risk that comes with managing 78% water content across a 16-hour wear day.