Further references for body modification theme...

Glass Eye, German, circa 1872-1930.

Hard (Haptic or Scleral) Contacts, circa 1940's.  These early contacts were meant to rest on the white portion (sclera) of the eye. While these were not intended to modify the body, certainly wearing hard contacts would have had some effect on how the eyelid looked opened or closed.

Kasey McMahon, Bird Cage Dress.

Antique Partial Dentures, date unknown. 

Erhardt's Mouth Speculum, circa 1884.

Advertisement for Erhardt's Mouth Speculum. 

Wooden  Elbow Splint, circa Civil War.

Spermatorrhea Ring, circa late Victorian to Early Edwardian Era. Back when masturbation was not only considered a sin but believed to be the cause of a number of illnesses people would place these devices around the genitals to prevent self stimulation. Often times these were used voluntarily.