The numbness you feel after upper blepharoplasty is totally normal. After any surgical incision, no matter were it is, there will be various degrees of temporary numbness. Most often numbness goes away by 6 months, any remaining odd feelings around the incision may last longer but I have never seen this with either upper or lower eyelid surgery as these areas have multiple nerves providing sensation.
It is normal for the skin adjacent to recent surgery to be numb. Nerve endings are bruised with the procedure. It may take a few months for sensation to totally return. Good luck. Donald R. Nunn MD Atlanta Plastic Surgeon