Eye ointments are free from germs (sterile) before the bottle top is opened. Once it is opened:
If you need to use two eye ointments, you should apply one of the eye ointments as per the instructions above; then, wait about half an hour before you apply the second eye ointment. This is in order to allow enough time for the first eye ointment to be absorbed.
If you have been prescribed an eye drop as well as an eye ointment you should normally apply the eye drop first. Wait five minutes and then apply your eye ointment.