General anesthesia for blepharoplasty?

I don't think it is needed for uppers.  lowers is a different questions.  For transconj it is possible without general, but the set up needs to be right.  Generally, I would recommend general if the lowers are involved.

Anesthesia choice for eyelid surgery

In great majority of cases eyelids surgery can be performed with properly
administered sedation anesthesia. Of course it requites a surgeon with skills
and knowledge of Periorbital anatomy to properly administered anesthetic into
the tissues. More importantly is that the procedure is performed in a certified
facility, where appropriate equipment, protocols and staff is present.

Almost any eyelid surgery can safely and comfortably be performed under local anesthesia with or without IV sedation, with much quicker recovery. General anesthesia is usually not necessary.  I perform 99% of my eyelid surgeries under local anesthesia with or without sedation. Exceptions include children or uncooperative patients. See an oculoplastic surgeon.