Chemical engineering researchers at McMaster University have found that hyaluronic acid, a common fluid found in the body, can be used as a natural moisturising agent in contact lenses, without affecting optical properties.

Hyaluronic acid is a natural polymer that acts to reduce friction. On average a person has 15g of hyaluronic acid in their body, a third of which is replenished daily. The body uses hyaluronic acid to repair skin, provide resiliency in cartilage, and contribute to the growth and movement or cells. It is also used in the medical profession to treat patients with dry eyes, in cataract surgery and for other eye-related procedures.

In addition to preventing dryness commonly experienced by contact lens wearers, hyaluronic acid also considerably reduces the build-up of proteins that can cloud contact lens material.

While manufacturers are yet to produce contact lenses with hyaluronic acid, the researchers remain hopeful.

Heather Sheardown, McMaster University, explained: “We’ve shown that the process works. We’re optimistic that a manufacturer will see the benefits of using this naturally-based technology to provide contact lens wearers with greater comfort and convenience.”