While we're in the mood to "that that thing off", ...I would also strongly suggest you consider replacing that fan with a 2-blade fan from Snyders. If you choose not to take it off, very likely it will take itself off for you.
BTW, I can empathize with you regarding the detached retina. I had that happen to my right eye several years ago while attending Hershey, and I did not lay face-down like they told me to do and I only have about 90% peripheral vision in that eye as a result. My suggestion is to do EXACTLY as they tell you.