Can dose of steriods affect a minor surgical procedure like blepharoplasty?

Your treatment for tinnitus with steroids can be undertaken safely without impact on your healing or outcome of your blepharoplasty. Some patients are administered a dose of steroids intravenously at the time of their surgery. Some surgeons (not me) routinely prescribe Medrol Dose Packs peri-operatively with any facial surgery. This has been studied and not been shown to actually improve the overall swelling. It has, however, been shown to not impact the outcome whatsoever. I would however discuss this with the anesthesiologist and your surgeon so that they can make proper adjustments in any medications that they may choose to utilize for your specific surgery.

We frequently give a short course of steroids after eyelid or facial surgery.  So this short course of steroids that you are on should not affect the outcome.  I am assuming it is also not a large dose that you are on, but make sure you tell your surgeon so that he is aware of it.   

A short course of steroids likely would not affect your healing or risk of infection, especially around the eyes where infections are extremely unlikely.However your surgeon should know the dosage of the steroids. Surgeons approach to surgery varies and your surgeon may decide to postpone an elective case.

A low dose of steroids is not likely to affect the result of your blepharoplasty.  Concerns for patients on steroids is an increased risk of infection and poor wound healing but the short course you will take for your tinnitus should have no affect on your surgery.  If you have any concern at all tell your surgeon and you could postpone the surgery till 2 weeks after your steroid course is over.  One possible benefit of the steroids could be less swelling after your surgery, as steroids are anti-inflammatory medications.

Much depends on precisely your individual circumstances.  You may be ok to have surgery or your surgeon may consider postponing surgery.