Sodium Hyaluronate (HA)
What is HA?
Sodium hyaluronate, aka hyaluronic acid or HA, is a
naturally occurring linear structured polysaccharide found in the aqueous and vitreous humor and the synovial fluid of joints. It is increasingly popular in DRY EYE preparations in differing concentrations.
HA is a viscoelastic, biological polymer which is pharmacologically inert, making it non-toxic. Much of its success in artificial tear formulations is based around sodium hyaluronate demonstrating so-called non-Newtonian behavior, in that, just like the tear film itself, it becomes less viscous during the blink with viscosity increasing
when the eye is open. This makes the eye feel more comfortable.