Yes, it is.
I had to use prescription fentanyl for 6-8 months a few years back. It's a small patch you stick on like a piece of tape.
Personal slide: God is very good, there was an innovative surgery to alleviate my issue. I had been super upset about using the fentanyl, just the addiction stories scared me. It pushed my husband and I to look into some of the newer, advancements in surgical techniques. I believe God guided us to the correct surgeon and "new thing." I was very concerned about withdrawal stuff. I never had any issues with that. Again, I'm giving God the glory for that, but it just didn't affect me.
Fentanyl can be absorbed into the body via inhalation, oral exposure or ingestion, or skin contact. It is not known whether fentanyl can be absorbed systemically through the eye.