Optimum Comfort contacts have a water content of 0%. The higher the water content in a contact lens, the more oxygen reaches the cornea during lens wear. There are other factors at play however so water content alone isn't enough of a factor to judge a lens' performance for a given person. High water content lenses can feel comfortable initially but may dry out over time, but this is not always the case. So it's good to know about the water content of a lens, but it's not everything. Consult your ECP to find out the best options for you.