Currently, Night & Day offers the highest level of oxygen permeability on the market. Followed by Biofinity and O2 Optix. Oxygen might not be the issue with your friend. I had a patient that I tried every silicone hydrogel lens on to no avail in curing redness. Switched patient to Clear Care. Still no success. Put the patient in a one-day disposable lens, redness went away. In the end, it was allergies, not oxygen at the root of the redness. I now start all my patients in ClearCare to save the time of switching solutions to eliminate the problem. I can go to mechanical issues right away.