In eye drops hyaluronic acid increases the viscosity of the solution). In eye drops with hyaluronic acid of a very long chain length (Hylan A), the molecular chains can become entangled with each other when the eye is open. These eye drops therefore remain on the surface of the eye for up to more than an hour.
When the eyelid is blinking, the long hyaluronic acid molecules arrange themselves in parallel, making these eye drops just as thin as eye drops with hyaluronic acid of shorter chain length.
Only the hyaluronic acid (Hylan A) used in Comfort Shield® offers optimum effectiveness and tolerability.
Further information on the flow behaviour of commercially available hyaluronic acid eye drops and the role of hyaluronic acid in maintaining the physiological balance of the eye is provided in the enclosed technical articles.