Do stitches usually pop open through the eyelid after ptosis surgery? 5 years post op.

Depending on the type of suture that was used and the depth at which the suture was passed, this can happen.  By this time the suture should not be doing much as far as the height of the eyelid.  The stitch will likely need to be removed to present injury to the eye, but each case is different.  I suggest you see an oculoplastic surgeon.  Good Luck
Dr Z

Some surgeons use permanent sutures which can rarely cause a problem years after surgery. See an oculoplastic surgeon to have the suture removed.