Viscosity of the eye drop "Pilopos" (0.5%)

Hi,
I am doing a study about the effect of viscosity on eye drop residence
time. I came across a study where they use Pilopos (Ursapharm,
Bubingen, Germany). It would be very helpful if I can know the
viscosity of that drug, but in the paper that is reporting the study
it was not given. I did a search on the web but could not find any
information too. If anyone can help me find out about the viscosity of
Pilopos it will be really appreciated.
Thank you very much.

Heng Zhu
Graduate research assistant
Dept. of Chemical Engineering
University of Florida