Hyabak - 10ml bottle. Moisturising and lubricating solution for eyes and contact lenses. Hyabak(R) multi-dose eye drops contain 0.15% sodium hyaluronate for long lasting relief from eye discomfort and dry feeling eyes. As natural as tears... The best of both worlds: Sodium Hyaluronate and Preservative-free. All the Sodium Hyaluronate properties... In the ABAK(R) bottle... Drop for drop it's economical and gives the patient 2 months treatment in a bottle little larger than a single dose unit. Optimal water retention - Like a sponge, it retains water and releases it progressively. Viscoelasticity and pseudoplasticity - Viscosity increases with eyelid opening. Viscosity decreases with eyelid closing. Mucoadhesisvity - Increases time of contact with the ocular surface. Highly Tolerated - Naturally present in tissues.