For this reason, a bland ophthalmic ointment like fresh PM ointment or lacrilube is generally better tolerated but more expensive. Some Doctors recommend a medicated ointment like erythromycin ophthalmic ointment for this purpose. Call your surgeon and see what they recommend.
You should ask your surgeon what ointment he would like you to use. Most surgeons will prescribe some sort of an antibiotic ointment. If not, a little Vaseline should be fine too. Basically want to keep it moist as it will heal faster, have less scab formation, and less itching.