Lens modification unit used by Kevin Michael Tuohy (1919-1968), a contact lens fitter who was affiliated with Solex Laboratories in California, and who filed a patent for the first corneal contact lens made entirely of PMMA, in 1948.
Ref: Kevin M. Tuohy, “Contact Lens,” U.S. Patent 2,510,438 (June 6, 1950), assigned to Solex Laboratories, Inc.